XXI.  This, then, is our reply to those who would puzzle us; not given willingly indeed (for light talk and contradictions of words are not agreeable to the faithful, and one Adversary is enough for us), but of necessity, for the sake of our assailants (for medicines exist because of diseases), that they may be led to see that they are not all-wise nor invincible in those superfluous arguments which make void the Gospel.  For when we leave off believing, and protect ourselves by mere strength of argument, and destroy the claim which the Spirit has upon our faith by questionings, and then our argument is not strong enough for the importance of the subject (and this must necessarily be the case, since it is put in motion by an organ of so little power as is our mind), what is the result?  The weakness of the argument appears to belong to the mystery, and thus elegance of language makes void the Cross, as Paul also thought. 1 Cor. i. 17.  For faith is that which completes our argument.  But may He who proclaimeth unions and looseth those that are bound, and who putteth into our minds to solve the knots of their unnatural dogmas, if it may be, change these men and make them faithful instead of rhetoricians, Christians instead of that which they now are called.  This indeed we entreat and beg for Christ’s sake.  Be ye reconciled to God, 2 Cor. v. 20. and quench not the Spirit; 1 Thess. v. 19. or rather, may Christ be reconciled to you, and may the Spirit enlighten you, though so late.  But if you are too fond of your quarrel, we at any rate will hold fast to the Trinity, and by the Trinity may we be saved, remaining pure and without offence, until the more perfect shewing forth of that which we desire, in Him, Christ our Lord, to Whom be the glory for ever.  Amen.