The primary and sovereign place assigned to reason in Tillotson's conception of man as a being able to know and serve God involved some consequences which must be mentioned separately, though they are closely connected with one another.

It led him, if not to reject, at all events to regard with profound distrust all assumptions of any gift of spiritual discernment distinguishable from ordinary powers of understanding. Tillotson's view was that the Spirit of God enlightens the human mind only through the reason, so that the faith of Abraham, for example, 'was the result of the wisest reasoning.'[220] He allows that the spiritual presence may act upon the reason by raising and strengthening the faculty, by making clear the object of inquiry, by suggesting arguments, by holding minds intent upon the evidence, by removing the impediments which hinder assent, and especially by making the persuasion of a truth effectual on the life.[221] This, however, is the very utmost that Tillotson could concede to those who dwell upon the presence within the soul of an inward spiritual light.

Tillotson gave great offence to some of his contemporaries by some expressions he has used in relation to the degree of assurance which is possible to man in regard of religious truths. He based all assent upon rational evidence. But he unhesitatingly admitted that mathematics only admit of clear demonstration; in other matters proof consists in the best arguments that the quality and nature of the thing will bear. We may be well content, he said, with a well-grounded confidence on matters of religious truth corresponding to that which is abundantly sufficient for our purposes in the conduct of our most important worldly interests. A charge was thereupon brought against him of authorising doubt and opening a door to the most radical disbelief. The attack scarcely deserved Tillotson's somewhat lengthy defence. He had but re-stated what many before him had observed as to the exceptional character of demonstrative evidence, and the folly of expecting it where it is plainly inapplicable. A religious mind, itself thoroughly convinced, may chafe against possibility of doubt, but may as well complain against the conditions of human nature. Yet the controversy on this point between Tillotson and his opponents is instructive in forming a judgment upon the general character of religious thought in that age. Tillotson appears, on the one hand, to have been somewhat over-cautious in disclaiming the alleged consequences of his denial of absolute religious certainty. He allows the theoretical possibility of doubt, but speaks as if it were essentially unreasonable. He shows no sign of recognising the sincere faith that often underlies it; that prayerful doubt may be in itself a kind of prayer; that its possibility is involved in all inquiry; that there is such a thing as an irreligious stifling of doubt, resulting in a spiritual and moral degradation; that doubt may sometimes be the clear work of the Spirit of God to break down pride and self-sufficiency, to force us to realise what we believe, to quicken our sense of truth, and to bid us chiefly rest our faith on personal and spiritual grounds which no doubts can touch. In this Tillotson shared in what must be considered a grave error of his age. Few things so encouraged the growth of Deism and unbelief as the stiff refusal on the part of the defenders of Christianity to admit of a frequently religious element in doubt. There was a general disposition, in which even such men as Bishop Berkeley shared, to relegate all doubters to the class of Deists and 'Atheists.' Tillotson strove practically against this fatal tendency, but his reasonings on the subject were confused. He earned, more perhaps than any other divine of his age, the love and confidence of many who were perplexed with religious questionings; but his arguments had not the weight which they would have gained if he had acknowledged more ungrudgingly that doubt must not always be regarded as either a folly or a sin.

Tillotson had learnt much from the Puritan and Calvinistic teaching which, instilled into him throughout his earlier years, had laid deep the foundations of the serious and fervent vein of piety conspicuous in all his life and writings. He had learnt much from the sublime Christian philosophy of his eminent instructors at Cambridge, Cudworth and Henry More, John Smith and Whichcote, under whom his heart and intellect had attained a far wider reach than they could ever have gained in the school of Calvin. But his influence in the eighteenth century would have been more entirely beneficial, if he had treasured up from his Puritan remembrances clearer perceptions of the searching power of divine grace; or if he had not only learnt from the Platonists to extol 'that special prerogative of Christianity that it dares appeal to reason,'[222] and to be imbued with a sense of the divine immutability of moral principles, but had also retained their convictions of unity with the Divine nature, implied alike in that eternity of morality and in that supremacy of the rational faculties,—together with a corresponding belief that there may be intimate communion between the spirit of man and his Maker, and that 'they who make reason the light of heaven and the very oracle of God, must consider that the oracle of God is not to be heard but in His holy temple,' that is to say, in the heart of a good man purged by that indwelling Spirit.[223] Considering the immense influence which Tillotson's Cambridge teachers had upon the development of his mind, it is curious how widely he differs from them in inward tone. It is quite impossible to conceive of their dwelling, as he and his followers did, upon the pre-eminent importance of the external evidences.

Tillotson could not adopt as unreservedly as he did his pervading tenet of the reasonableness of Christianity without yielding to reason all the rights due to an unquestioned leader. Like Henry More, he would have wished to take for a motto 'that generous resolution of Marcus Cicero,—rationem, quo ea me cunque ducet, sequar.'[224] 'Doctrines,' he said, 'are vehemently to be suspected which decline trial. To deny liberty of inquiry and judgment in matters of religion, is the greatest injury and disparagement to truth that can be, and a tacit acknowledgment that she lies under some disadvantage, and that there is less to be said for her than for error.'[225] 'Tis only things false and adulterate which shun the light and fear the touchstone.' He has left a beautiful prayer which his editor believed he was in the habit of using before he composed a sermon. In it he asks to be made impartial in his inquiry after truth, ready always to receive it in love, to practise it in his life, and to continue steadfast in it to the end. He adds, 'I perfectly resign myself, O Lord, to Thy counsel and direction, in confidence that Thy goodness is such, that Thou wilt not suffer those who sincerely desire to know the truth and rely upon Thy guidance, finally to miscarry.'[226]

These last words are a key to Tillotson's opinion upon a question about which, in the earlier part of the eighteenth century, there was much animated controversy—in what light sincere error should be regarded. If free inquiry on religious subjects is allowable and right, is a man to be held blameless if he arrives at false conclusions in respect of the fundamental articles of faith? That the answer to be given might involve grave issues continually appeared in discussion alike with Roman Catholics and with Deists. The former had no stronger argument against liberty of private judgment than to ask how those who freely granted it could pass any moral censure upon the heresies which might constantly result from it. The latter insisted that, whether they were right or wrong, no Protestant had any title to hold them in the slightest degree blameable before God or man for any opinions which were the result of conscientious research. Much was written on the subject by theologians of the generation which succeeded next after Tillotson, as for instance by Hoadly, Sykes, Whitby, Law, Hare, and Balguy. But in truth, if the premisses be granted—if free inquiry is allowable and the inquiry be conducted with all honesty of heart and mind—no candid person, whatever be his opinions, can give other than one answer. Kettlewell, High Churchman and Nonjuror, readily acknowledged that 'where our ignorance of any of Christ's laws is joined with an honest heart, and remains after our sincere industry to know the truth, we may take comfort to ourselves that it is involuntary and innocent.'[227] In this he agreed with his Low Church contemporary, Chillingworth, who said that 'To ask pardon of simple and involuntary errors is tacitly to imply that God is angry with us for them, and that were to impute to Him this strange tyranny of requiring brick where He gives no straw; of expecting to gather where He strewed not; of being offended with us for not doing what He knows we cannot do.'[228] Tillotson always speaks guardedly on the subject. He was keenly alive to the evil practical consequences which may result from intellectual error,—very confident that in all important particulars orthodox doctrine was the true and safe path, very anxious therefore not to say anything which might weaken the sense of responsibility in those who deviated from it. But he never attempted to evade the logical conclusion which follows from an acknowledged right of private judgment. In his practice as well as in his theory, he wholly admitted the blamelessness of error where there was ardent sincerity of purpose. He wrote several times against the Unitarians, but gladly allowed that many of them were thoroughly good men, honest and candid in argument,[229] nor did he even scruple to admit to a cordial friendship one of their most distinguished leaders, Thomas Firmin, a man of great beneficence and philanthropy.

There was no reservation in Tillotson's mind as to the general right of private judgment. 'Any man that hath the spirit of a man must abhor to submit to this slavery not to be allowed to examine his religion, and to inquire freely into the grounds and reasons of it; and would break with any Church in the world upon this single point; and would tell them plainly, "If your religion be too good to be examined, I doubt it is too bad to be believed."'[230] He grounded the right on three principles.[231] The first was, that essentials are so plain that every man of ordinary capacities, after receiving competent instruction, is able to judge of them. This, he added, was no new doctrine of the Reformation, but had been expressly owned by such ancient fathers as St. Chrysostom and St. Augustine. The second was, that it was a Scriptural injunction. St. Luke, in the Acts, St. Paul and St. John in their Epistles, had specially commended search, examination, inquiry, proof. The third was, that even those who most disputed the right were forced nevertheless to grant it in effect. Whenever they make a proselyte they argue with him, they appeal to his reason, they bid him to use his judgment. If it were urged that it could not be accordant to the Divine purpose to give full scope to a liberty which distracted unity and gave rise to so much controversy and confusion,—we must judge, he replied, by what is, not by what we fancy ought to be. We could be relieved from the responsibilities of judging for ourselves only by the existence of an infallible authority to which we could appeal. This is not granted either in temporal or in spiritual matters. Nor is it needed. A degree of certainty sufficient for all our needs is attainable without it. Even in Apostolic times, when it might be said to have existed, error and schism were not thereby prevented. 'With charity and mutual forbearance, the Church may be peaceful and happy without absolute unity of opinion.'[232] Let it be enough that we have guides to instruct us in what is plain, and to guide us in more doubtful matters. After all, 'there is as much to secure men from mistakes in matters of belief, as God hath afforded to keep men from sin in matters of practice. He hath made no effectual and infallible provision that men shall not sin; and yet it would puzzle any man to give a good reason why God should take more care to secure men against errors in belief than against sin and wickedness in their lives.'[233]

Tillotson, however, did not omit to add four cautions as to the proper limits within which the right of private judgment should be exercised. (1) A private person must only judge for himself, not impose his judgment on others. His only claim to that liberty is that it belongs to all. (2) The liberty thus possessed does not dispense with the necessity of guides and teachers in religion; nor (3) with due submission to authority. 'What by public consent and authority is determined and established ought not to be gainsaid by private persons but upon very clear evidence of the falsehood or unlawfulness of it; nor is the peace and unity of the Church to be violated upon every scruple and frivolous pretence.' (4) There are a great many who, from ignorance or insufficient capacity, are incompetent to judge of any controverted question. 'Such persons ought not to engage in disputes of religion; but to beg God's direction and to rely upon their teachers; and above all to live up to the plain dictates of natural light, and the clear commands of God's word, and this will be their best security.'[234]

There has probably been no period in which liberty of thought on religious subjects has been debated in this country so anxiously, so vehemently, so generally, as in the earlier part of the eighteenth century. The Reformation had hinged upon it; but general principles were then greatly obscured in the excitement of change, and amid the multiplicity of secondary questions of more immediate practical interest. For a hundred and fifty years after the first breach with Rome, it may be said that private judgment was most frequently considered in connection with a power of option between different Church communions. A man had to choose whether he would adhere to the old, or adopt the new form of faith—whether he would remain staunch to the reformed Anglican Church, or cast in his lot with the Puritans, or with one or other of the rising sects,—whether Episcopacy or Presbyterianism most conformed to his ideas of Church government. When at last these controversies had abated, the full importance of the principles involved in this new liberty of thought began to be fully felt. Their real scope and nature, apart from any transient applications, engaged great attention, first among the studious and thoughtful, among philosophers and theologians, but before long throughout the country generally. Locke among philosophers, Tillotson and Chillingworth among divines, addressed their reasonings not to the few, but to the many. Their arguments however would not have been so widely and actively discussed, had it not been for the Deists. Free-thought in reference to certain ecclesiastical topics had been for several generations familiar to every Englishman; but just at a time when reflecting persons of every class were beginning to inquire what was implied in this liberty of thought and choice, the term was unhappily appropriated by the opponents of revelation, and, as if by common consent, conceded to them. Notwithstanding all that could be urged by a number of eminent and influential preachers and writers, freethinking became a term everywhere associated with Deism and disbelief. It was a suicidal error, which rapidly gained ground, and lingers still. The Deists gained great advantage from it. They started as it were with an unchallenged verbal assumption that the most fundamental principle of correct reasoning was on their side. All inquiries as to truth, all sound research, all great reforms, demand free thought; and they were the acknowledged Freethinkers. A name could not have been chosen more admirably adapted to create, especially in young and candid minds, a prejudice in their favour. For the same reason, all who asserted the duty of fearless investigation in the interests of Christianity could only do so under penalty of incurring from many quarters loudly expressed suspicions of being Deists in disguise. Tillotson was by strong conviction an advocate of freethought. 'He is a Freethinker,' said all who were afraid of liberty. 'Therefore no doubt he is undermining Revelation, he is fighting the battle of the Deists.' 'Yes,' echoed the Deists, glad to persuade themselves that they had the sanction of his authority. 'He is a Freethinker; if not one of us, at all events he is closely allied with us.' Yet, on the whole, his fame and influence probably gained by it. Many who were inclined to Deistical opinions were induced to read Tillotson, and to feel the force of his arguments, who would never have opened a page of such a writer as Leslie. Many, again, who dreaded the Deists, but were disturbed by their arguments, were wisely anxious to see what was advanced against them by the distinguished prelate who had been said to agree with them in some of their leading principles. Meanwhile liberty of thought, independently of 'Freethinking,' in the obnoxious sense of the word, attracted a growing amount of attention. The wide interest felt in the ponderous Bangorian controversy, as it dragged on its tedious course, is in itself ample evidence of the desire to see some satisfactory adjustment of the respective bounds of authority and reason. No doubt Tillotson did more than any one else, Locke only excepted, to create this interest. It was an immense contribution to the general progress of intelligent thought on religious subjects, to do as much as was effected by these two writers in removing abstract ideas from the domain of theological and philosophical speculation, and transferring them, not perhaps without some loss of preciseness and definition, to the popular language of ordinary life. The eighteenth century erred much in trusting too implicitly to the powers of 'common sense.' Yet this direct appeal to the average understanding was in many ways productive of benefit. It induced people to realise to themselves, more than they had done, what it was they believed, and to form intelligible conceptions of theological tenets, instead of vaguely accepting upon trust what they had learnt from their religious teachers. Even while it depressed for the time the ideal of spiritual attainment, the defect was temporary, but the work real. 'By clearing away,' says Dorner, 'much dead matter, it prepared the way for a reconstruction of theology from the very depths of the heart's belief.'[235]

In calling upon all men to test their faith by their reason, Tillotson had to explain the relations of human reason to those articles of belief which lie beyond its grasp. There was the more reason to do this, because of the difficulties which were felt, and the disputes which had arisen about 'mysteries' in religion. Undoubtedly it is a word very capable of misuse. 'Times,' says the author last quoted, 'unfruitful in theological knowledge are ever wont to fall back upon mystery and upon the much abused demand of "taking the reason prisoner to the obedience of faith."' With some, religion has thus been made barren and ineffectual by being regarded as a thing to be passively accepted without being understood. Among others, it has been degraded into superstition by the same cause. When an appetite for the mysterious has been cherished, it becomes easy to attribute spiritual results to material causes, to the confusion of the first principles alike of morality and of knowledge. Some, through an ambition of understanding the unintelligible, have wasted their energies in a labyrinth of scholastic subtleties; others have surrendered themselves to a vague unpractical mysticism.