In the beginning of the fourth book Hilary refers back to the proof furnished in the previous books, written some time ago, of the Scriptural character of his faith and of the unscriptural nature of all the heresies. Setting aside the first book, which does not correspond to this description, we find what he describes in the second and third. These form a short connected treatise, complete in itself. It is much more academic than that of which we have already spoken; it deals briefly with all the current heresies (ii. 4 ff.), but shews no sign that one of them, more than the others, was an urgent danger. There is none of the passion of conflict; Hilary is in the mood for rhetoric, and makes the most of his opportunities. He expatiates, for instance, on the greatness of his theme (ii. 5), harps almost to excess upon the fisherman to whom mysteries so great were revealed (ii. 13 ff.), dilates, after the manner of a sermon, upon the condescension and the glory manifested in the Incarnation, describes miracles with much liveliness of detail (iii. 5, 20), and ends the treatise (iii. 24–26) with a nobly eloquent statement of the paradox of wisdom which is folly and folly which is wisdom, and of faith as the only means of knowing God. The little work, though it deals professedly with certain heresies, is in the main constructive. It contains far more of positive assertion of the truth, without reference to opponents, than it does of criticism of their views. In sustained calmness of tone—it recognises the existence of honest doubt (iii. 1),—and in literary workmanship, it excels any other part of the De Trinitate and in the latter respect is certainly superior to the more conversational Homilies on the Psalms. But it suffers, in comparison with the books which follow, by a certain want of intensity; the reader feels that it was written, in one sense, for the sake of writing it, and written, in another sense, for purposes of general utility. It is not, as later portions of the work were, forged as a weapon for use in a conflict of life and death. Yet, standing as it does, at the beginning of the whole great treatise, it serves admirably as an introduction. It is clear, convincing and interesting, and its eloquent peroration carries the reader on to the central portion of the work, which begins with the fourth book. Except that the second book has lost its exordium, for the same reason that the seventh has lost its conclusion, the two books are complete as well as homogeneous. Of the date nothing definite can be said. There is no sign of any special interest in Arianism; and Hilary’s leisure for a paper conflict with a dead foe like Ebionism suggests that he was writing before the strife had reached Gaul. The general tone of the two books is quite consistent with this; and we may regard it as more probable than not that they were composed before the exile; whether they were published at the time as a separate treatise, or laid on one side for a while, cannot be known; the former supposition is the more reasonable.