Waterland showed his strength in defence as well as in attack. He boldly grappled with the difficulties which the Catholic doctrine of the Trinity unquestionably involves, and his method of dealing with these difficulties forms not the least valuable part of his writings on the subject.
Into the labyrinths, indeed, of metaphysical speculation he distinctly declined to follow his opponents. They, as well as he, acknowledged, or professed to acknowledge, the force of the testimony from Scripture and the fathers. He is ready to join issue on this point, 'Is the Catholic doctrine true?' but for resolving this question he holds that we must have recourse to Scripture and antiquity. 'Whoever debates this question should forbear every topic derived from the nature of things, because such arguments belong only to the other question, whether the doctrine be possible, and in all reason possibility should be presupposed in all our disputes from Scripture and the fathers.' He consistently maintains that our knowledge of the nature of God is far too limited to allow us to dogmatise from our own reason on such a subject. 'You can never fix any certain principles of individuation, therefore you can never assure me that three real persons are not one numerical or individual essence. You know not precisely what it is that makes one being, one essence, one substance.' There are other difficulties in the nature of the Godhead quite as great as any which the doctrine of the Trinity involves. 'The Omnipresence, the Incarnation, Self-existence, are all mysteries, and eternity itself is the greatest mystery of all. There is nothing peculiar to the Trinity that is near so perplexing as eternity.' And then he finely adds: 'I know no remedy for these things but a humble mind. If we demur to a doctrine because we cannot fully and adequately comprehend it, is not this too familiar from a creature towards his Creator, and articling more strictly with Almighty God than becomes us?'
Is the Trinity a mysterious doctrine? 'The tremendous Deity is all over mysterious, in His nature and in His attributes, in His works and in His ways. If not, He would not be divine. If we reject the most certain truths about the Deity, only because they are incomprehensible, when everything about Him must be so of course, the result will be Atheism; for there are mysteries in the works of nature as well as in the Word of God.'
If it be retorted, Why then introduce terms and ideas which by your own admission can only be imperfectly understood? Why not leave such mysteries in the obscurity in which they are shrouded, and not condemn those who are unable to accept without understanding them? The reply is, 'It is you and not we who are responsible for the discussion and definition of these mysteries. The faith of the Church was at first, and might be still, a plain, simple, easy thing, did not its adversaries endeavour to perplex and puzzle it with philosophical niceties. Early Christians did not trouble their heads with nice speculations about the modus of the Three in One.' 'All this discourse about being and person is foreign and not pertinent, because if both these terms were thrown out, our doctrine would stand just as before, independent of them, and very intelligible without them. So it stood for about 150 years before person was heard of in it, and it was later before being was mentioned. Therefore, if all the objection be against these, however innocent, expressions, let the objectors drop the name and accept the thing.' It was no wish of Waterland to argue upon such mysteries at all. 'Perhaps,' he says, 'after all, it would be best for both of us to be silent when we have really nothing to say, but as you have begun, I must go on with the argument.... It is really not reasoning but running riot with fancy and imagination about matters infinitely surpassing human comprehension. You may go on till you reason, in a manner, God out of His attributes, and yourself out of your faith, and not know at last when to stop.' These are weighty and wise words, and it would be well if they were borne in mind by disputants on this profound mystery in every age. But while deprecating all presumptuous prying into the secret nature of God, Waterland is perfectly ready to meet his adversaries on that ground on which alone he thinks the question can be discussed.
Summing up and setting in one compendious view all that the modern Arians taught in depreciation of Christ, Waterland showed that in spite of their indignation at being represented as teaching that Christ was a mere creature, they yet clearly taught that He was 'brought into existence as well as any other creature, that He was precarious in existence, ignorant of much more than He knows, capable of change from strength to weakness, and from weakness to strength; capable of being made wiser, happier, and better in every respect; having nothing of his own, nothing but what He owes to the favour of His lord and governor.' By the arguments which they used to prove all this, they put a most dangerous weapon into the hands of Atheists, or at least into the hands of those who denied the existence of such a God as is revealed to us in Holy Scripture. 'Through your zeal against the divinity of the Son, you have betrayed the cause to the first bold Marcionite that shall deny the eternal Godhead of the Father and the Son, and assert some unknown God above both. The question was, whether a particular Person called the Father be the Eternal God. His being called God would amount to nothing, that being no more than a word of office. His being Creator, nothing; that you could elude. His being Jehovah, of no weight, meaning no more than a person true and faithful to his promises. Almighty is capable of a subordinate sense. The texts which speak of eternity are capable of a subordinate sense. The term "first cause" is not a Scriptural expression.'
Waterland boldly faces the objection against the Catholic doctrine of the Trinity which was derived from certain texts of Scripture which taken by themselves might seem to favour the Arian view. How, for example, it was asked, could it be said that all power was given unto Christ (Matt, xxviii. 18), and that all things were put under His feet after His Resurrection (Eph. i. 22), if He was Lord long before? 'The Logos,' replies Waterland, 'was from the beginning Lord over all, but the God man (Θεάνθρωπος) was not so till after the Resurrection. Then He received in that capacity what He had ever enjoyed in another; He received full power in both natures which He had heretofore only in one.'[440] The passage on which the Arians insisted most of all, and which they constantly asserted to be by itself decisive of the whole question, is 1 Corinthians viii. 6. There, they asserted, the Son is excluded in most express words from being one with the Supreme God. Dr. Clarke told Waterland in downright terms that 'he should be ashamed when he considered that he falsified St. Paul, who said, "To us there is but one God, the Father."' 'But,' replies Dr. Waterland, 'do we who make the Son essentially the same God with that one, and suppose but one God in all, or you who make two Gods, and in the same relative sense, God to us, falsify St. Paul? We can give a reason why the Son is tacitly included, being so intimately united to the Father as partaker of the same divine nature, but that any creature should not be excluded from being God is strange.'
To turn now from Scripture to antiquity. The question as to what was the opinion of the ante-Nicene fathers had been so thoroughly handled by Bishop Bull, that Waterland (his legitimate successor) had no need to enter upon it at large over again. But Bishop Bull had done his work too well to suit the theory of Dr. Clarke and his friends. Although the latter professed to find in the early fathers a confirmation of their views, yet from a consciousness, perhaps, of the unsatisfactoriness of this confirmation they constantly depreciate the value of patristic evidence. In connection, therefore, with the subject of the Trinity, Waterland clearly points out what is and what is not the true character of the appeal to antiquity. The fathers are certain proofs in many cases of the Church's doctrine in that age, and probable proofs of what that doctrine was from the beginning. In respect of the latter they are inferior additional proofs when compared with plain Scripture proof; of no moment if Scripture is plainly contrary, but of great moment when Scripture looks the same way, because they help to fix the true interpretation in disputed texts. Waterland, however, would build no article of faith on the fathers, but on Scripture alone. If the sense of Scripture be disputed, the concurring sentiments of the fathers in any doctrine will be generally the best and safest comments on Scripture, just as the practice of courts and the decisions of eminent lawyers are the best comments on an Act of Parliament made in or near their own times, though the obedience of subjects rests solely on the laws of the land as its rule and measure. To the objection that interpreting Scripture by the ancients is debasing its majesty and throwing Christ out of His throne, Waterland replies in somewhat stately terms, 'We think that Christ never sits more secure or easy on His throne than when He has His most faithful guards about Him, and that none are so likely to strike at His authority or aim at dethroning Him as they that would displace His old servants only to make way for new ones.' But this respect for the opinion of antiquity in no way involved any compromise of the leading idea of all eighteenth-century theology, that it should follow the guidance of reason. Reason was by no means to be sacrificed to the authority of the fathers. Indeed, 'as to authority,' he says, 'in a strict and proper sense I do not know that the fathers have any over us; they are all dead men; therefore we urge not their authority but their testimony, their suffrage, their judgment, as carrying great force of reason. Taking them in here as lights or helps is doing what is reasonable and using our own understandings in the best way.' 'I follow the fathers,' he adds, 'as far as reason requires and no further; therefore, this is following our own reason.' In an age when patristic literature was little read and lightly esteemed this forcible, and at the same time highly reasonable, vindication of its importance had a value beyond its bearing upon the doctrine of the Trinity, in connection with which the subject was introduced by our author.[441]
Here our notice of the points at issue between Dr. Waterland and the modern Arians, so far as they concerned the truth of the Catholic doctrine of the Trinity, may fitly close. But there was yet another question closely connected with the above which it concerned the interests of morality, no less than of religion, thoroughly to sift. It was no easy task which Dr. Clarke and his friends undertook when they essayed to prove from Scripture and antiquity that the Son and Holy Ghost were not one with the supreme God. But they attempted a yet harder task than this. They contended that their views were not irreconcilable with the formularies and Liturgy of the Church of England. The more candid and ingenuous mind of Whiston saw the utter hopelessness of this endeavour. It was, he says, an endeavour 'to wash the blackmore white,' and so, like an honest man as he was, he retired from her communion. Dr. Clarke could not, of course, deny that there was at least an apparent inconsistency between his views and those of the Church to which he belonged. One of the chapters in his 'Scripture Doctrine of the Trinity' is devoted to a collection of 'passages in the Liturgy which may seem in some respects to differ from the foregoing doctrine.' But he and his friends were 'ready to subscribe any test containing nothing more than is contained in the Thirty-nine Articles;' their avowed principle being that 'they may do it in their own sense agreeably to what they call Scripture.' In his 'Case of Arian Subscription' Dr. Waterland had no difficulty in showing the utter untenableness of this position. He maintained that 'as the Church required subscription to her own interpretation of Scripture, so the subscriber is bound to that and that only.' 'The rules,' he says, 'for understanding what her sense is are the same as for understanding oaths, laws, &c.—that is, the usual acceptation of words, the custom of speech at the time being, the scope of the writer from the controversies then on foot,' &c. It is but a shallow artifice for fraudulent subscribers to call their interpretation of Scripture, Scripture. The Church has as good a right to call her interpretation Scripture. Let the Arian sense be Scripture to Arians; but then let them subscribe only to Arian subscriptions.
The case of Arian subscriptions was really part of a larger question. There were some who, without actually denying the truth of the doctrine of the Trinity, doubted whether it was of sufficient importance or clearly enough revealed to make it a necessary article of the Christian faith. These were sometimes called Episcopians, a name derived from one Episcopius, an amiable and not unorthodox writer of the seventeenth century, who was actuated by a charitable desire to include as many as possible within the pale of the Christian Church, and to minimize the differences between all who would, in any sense, own the name of Christians. The prevalence of such views in Dr. Waterland's days led him to write one of his most valuable treatises in connection with the Trinitarian controversy. It was entitled, 'The Importance of the Doctrine of the Trinity Asserted,' and was addressed to those only who believed the truth of the doctrine but demurred to its importance. Waterland concludes this work, which is rather a practical than a controversial treatise, with some wise words of caution to those persons of 'more warmth than wisdom,' who from a mistaken liberality would make light of heresy.
It is now time to close this sketch of the method in which this great writer—one of the few really great divines who belong to the eighteenth century—handled the mysterious subject of the Trinity. Not only from his profound learning and acuteness, but from the general cast of his mind, Waterland was singularly adapted for the work which he undertook. To treat this subject of all subjects, the faculties both of thinking clearly and of expressing thoughts clearly are absolutely essential. These two qualifications Dr. Waterland possessed in a remarkable degree. He always knew exactly what he meant, and he also knew how to convey his meaning to his readers. His style is nervous and lucid, and he never sacrifices clearness to the graces of diction. His very deficiencies were all in his favour. Had he been a man of a more poetical temperament he might have been tempted, like Platonists and neo-Platonists, to soar into the heights of metaphysical speculations and either lose himself or at least render it difficult for ordinary readers to follow him. But no one can ever complain that Dr. Waterland is obscure. We may agree or disagree with his views, but we can never be in doubt what those views are. Had Waterland been of a warmer and more excitable temperament he might have been tempted to indulge in vague declamation or in that personal abusiveness which was only too common in the theological controversies of the day. Waterland fell into neither of these snares; he always argues, never declaims; he is a hard hitter in controversy, but never condescends to scurrilous personalities. The very completeness of his defence of the doctrine of the Trinity against Arian assailants furnishes, perhaps, the reason why this part of his writings has not been so widely and practically useful as it deserves to be. He so effectually assailed the position of Dr. Clarke and his friends that it has rarely been occupied by opponents of the Catholic doctrine in modern days.