So great a paradox of course cannot be maintained as that truth literally leads to falsehood, or that there can be an excess of virtue; but the appearance of things and the popular language about them will at least serve us in obtaining an additional test for the discrimination of a _bonâ fide_ development of an idea from its corruption. A true development, then, may be described as one which is conservative of the course of antecedent developments being really those antecedents and something besides them: it is an addition which illustrates, not obscures, corroborates, not corrects, the body of thought from which it proceeds; and this is its characteristic as contrasted with a corruption. 2. For instance, a gradual conversion from a false to a true religion, plainly, has much of the character of a continuous process, or a development, in the mind itself, even when the two religions, which are the limits of its course, are antagonists. Now let it be observed, that such a change consists in addition and increase chiefly, not in destruction. "True religion is the summit and perfection of false religions; it combines in one whatever there is of good and true separately remaining in each. And in like manner the Catholic Creed is for the most part the combination of separate truths, which heretics have divided among themselves, and err in dividing. So that, in matter of fact, if a religious mind were educated in and sincerely attached to some form of heathenism or heresy, and then were brought under the light of truth, it would be drawn off from error into the truth, not by losing what it had, but by gaining what it had not, not by being unclothed, but by being 'clothed upon,' 'that mortality may be swallowed up of life.' That same principle of faith which attaches it at first to the wrong doctrine would attach it to the truth; and that portion of its original doctrine, which was to be cast off as absolutely false, would not be directly rejected, but indirectly, _in_ the reception of the truth which is its opposite. True conversion is ever of a positive, not a negative character."[201:1] Such too is the theory of the Fathers as regards the doctrines fixed by Councils, as is instanced in the language of St. Leo. "To be seeking for what has been disclosed, to reconsider what has been finished, to tear up what has been laid down, what is this but to be unthankful for what is gained?"[201:2] Vincentius of Lerins, in like manner, speaks of the development of Christian doctrine, as _profectus fidei non permutatio_.[201:3] And so as regards the Jewish Law, our Lord said that He came "not to destroy, but to fulfil." 3.