The inquiry into method in the seventeenth century had led men to break with authority, and rebuild from its foundations the temple of truth. Locke, imbibing this spirit, had gauged anew the human understanding, and had sought a new origin for its knowledge, and given expression to the appeal to the reasoning powers, which marked the age. Political circumstances had not only generated free inquiry, but had required each man to form his political creed. In all departments reason was appealed to. Even the province of the imagination was invaded by it, and perfection of form preferred to freshness of conception in art and poetry. The doubt of the age reflected the same spirit. Whether its advocates belonged to the school of Descartes or of Locke, both alike examined religion by the standard of psychology and ethics. That which was to be believed was to be comprehended as well as apprehended. Yet the appeal was not made to reason in its highest form; and, with a show of depth, philosophy nevertheless failed to exhibit the deepest analysis.

We have watched the exhibition of the successive phases of the attack, and have seen reason, first examining the method of theology, protesting against mystery in doctrine or morals; next criticising the historic reality of the evidence offered for its doctrines; then denying the moral utility of revelation, or attacking the doctrines and internal truths; lastly denying the validity of testimony for the supernatural.

In the later steps the influence of the French school of speculation is already observable, mingling itself with English deism. Consequently the subsequent traces of unbelief in England must be deferred till the nature of this movement has been explained.

Deism stands contrasted with the unbelief of other times by certain peculiarities. In its coarse spirit of [pg 155] bitter hostility, and want of real insight into the excellence of the system which it opposed, it recalls in some respects the attack of the ancient heathen Celsus; and the difficulties propounded are frequently not dissimilar to those stated by him, though resulting from a different philosophical school. The tenacious grasp which it maintained of the doctrine of the unity of God would cause it to bear a closer resemblance to the system of Julian, if the deists had not lacked the literary tastes which strengthened his love for heathenism. The monotheism constitutes also a line of demarcation between deism and more modern forms of unbelief. It restrained the deists from falling into the forms of subtle pantheism previously noticed, and the atheism which will hereafter meet us. The character of their doubts too, selected from patent facts of mind and heart, which appealed to common sense, and were not taken from a minute literary criticism, which removes doubt from the sphere of the ordinary understanding into the world of literature, separates them from more modern critical unbelief.

Standing thus apart, characterised by intense attachment to monotheism, and placing its foundation in the great facts of nature, deism errs by defect rather than excess; in that which it denies, not in that which it asserts. It is a system of naturalism or rationalism; the interpretation which reason, without attaining the deepest analysis, offers of the scheme of the world, natural and moral. Its only parallel is the particular species of German thought derived from it which existed at the close of the last century, and sought like it to reduce revealed religion to natural.[487]

Whether emotional causes, personal moral faults coincided with these intellectual causes, and were the obstacle which prevented the attainment of a deeper insight into the mysteries of revelation, and made them to halt in the mysteries of nature, ought to be taken into account in forming a judgment on the concrete cases, but does not so properly belong to the general [pg 156] consideration in which we are now engaged, of tracing the types of deist thought. Some of the deists were very moral men, a few immoral; but the truth or untruth of opinions may be studied apart from the character of the persons who maintain them.

The movement, if viewed as a whole, is obsolete. If the same doubts are now repeated, they do not recur in the same form, but are connected with new forms of philosophy, and altered by contact with more recent criticism. In the present day sceptics would believe less than the deists, or believe more, both in philosophy and in criticism. In philosophy, the fact that the same difficulties occur in natural religion as well as in revealed, would now throw them back from monotheism into atheism or pantheism; while the mysteries of revelation, which by a rough criticism were then denied, would be now conceded and explained away as psychological peculiarities of races or individuals. In criticism, the delicate examination of the sacred literature would now prevent both the revival of the cold unimaginative want of appreciation of its extreme literary beauty, and the hasty imputation of the charge of literary forgery against the authors of the documents. In the deist controversy the whole question turned upon the differences and respective degrees of obligation of natural and revealed religion, moral and positive duties; the deist conceding the one, denying the other.

The permanent contribution to thought made by the controversy consisted in turning attention from abstract theology to psychological, from metaphysical disquisitions on the nature of God to ethical consideration of the moral scheme of redemption for man. Theology came forth from the conflict, reconsidered from the psychological point of view, and readjusted to meet the doubts which the new form of philosophy—psychology and ethics—might suggest.

The attack of revealed religion by reason awoke the defence; and no period in church history is so remarkable for works on the Christian evidences,—grand monuments of mind and industry. The works of defenders [pg 157] are marked by the adoption of the same basis of reason as their opponents; and hence the topics which they illustrate have a permanent philosophical value, though their special utility as arguments be lessened by the alteration in the point of view now assumed by free thought.

The one writer whose reputation stands out preeminently above the other apologists is bishop Butler.[488] His praise is in all the churches. Though the force of a few illustrations in his great work may perhaps have been slightly weakened by the modern progress of physical science,[489] and though objections have been taken on the ground that the solutions are not ultimate,[490] mere media axiomata; yet the work, if regarded as adapted to those who start from a monotheistic position, possesses a permanent power of attractiveness which can only be explained by its grandeur as a work of philosophy, as well as its mere potency as an argument. The width and fulness of knowledge displayed in the former respect, together with the singular candour and dignified forbearance of its tone, go far to explain the secret of its mighty influence. When viewed in reference to the deist writings against which it was designed, or the [pg 158] works of contemporary apologists, Butler's carefulness in study is manifest. Though we conjectured that Tindal's work[491] was the one to which he intended chiefly to reply, yet not one difficulty in the philosophy, hardly one in the critical attacks made by the various deists, is omitted; and the best arguments of the various apologists are used. But both the one and the other are so assimilated by his own mind, that the use of them only proves his learning, without diminishing his originality. They are so embodied into his system, that it is difficult even for a student well acquainted with the deist and apologetic literature to point precisely to the doubt or parallel argument which may have suggested to him material of thought. And thus, though his work as an argument ought always to be viewed in relation to his own times, yet the omission of all temporary means of defence, and the restricting himself to the use of those permanent facts which indelibly belong to human nature, and to the scheme of the world, have caused his work to possess an enduring interest, and to be a κτῆμα ἐς ἀεί. The persuasive moderation of its tone also proves that Butler had really weighed the evidence. In its absence of arrogant denunciation, and its candid admission that the evidence of religion is probable, not demonstrative; and in the request that the whole evidence may be weighed like a body of circumstantial proofs, we can perceive that Butler had felt the doubts as well as understood them, and evidently meant his works for the doubter rather than for the Christian; [pg 159] to convince foes, or support the hesitating, rather than to win applause from friends.