[66] In his correspondence with Scaliger, no indications of any vacillation as to religion appear. Of the unfortunate conference between Du Plessis Mornay and Du Perron, in the presence of Henry IV., where Casaubon himself had been one of the umpires, he speaks with great regret, though with a full acknowledgment that his champion had been worsted. Quod scribis de congressu Diomedis cum Glauco, sic est omnino, ut tu judicas rectè. Vir optimus, si eum sua prudentia orbi Gallico satis explorata non defecisset, nunquam ejus certaminis aleam subiisset. After much more he concludes: Equidem in lacrymas prope adducor, quoties subit animo tristissima illius diei species, cum de ingenua nobilitate, de excellenti ingenio, de ipsa denique veritate pompaticè adeo vidi triumphatum. Epist. 214. (Oct., 1600.) See also a letter to Heinsius on the same subject. Cassaub. Epist. 809. In a letter to Perron himself, in 1604, he professed to adhere to Scripture alone, against those who vetustatis auctoritatem pro ratione obtendunt. Epist. 417. A change however came gradually over his mind, and he grew fascinated by this very authority of antiquity. In 1609 he had, by the king’s command, a conference on religion with Du Perron, but very reluctantly, and, as his biographer owns, quibusdam visus est quodammodo cespitasse. Casaubon was, for several reasons, no match in such a disputation for Perron. In the first place, he was poor and weak, and the other powerful, which is a reason that might dispense with our giving any others; but secondly, he had less learning in the fathers; and thirdly, he was entangled by deference for these same fathers; finally, he was not a man of as much acuteness and eloquence as his antagonist. The issue of battle does not follow the better cause, but the sharper sword, especially when there is so much _ignoratio elenchi_ as in this case.