John 6:69

"And we have believed and have known." Not have known and believed, but "believed and known." For we believed in order to know; for if we wanted to know first, and then to believe, we should not be able either to know or to believe. What have we believed and known? "That Thou art Christ, the Son of God;" that is, that Thou art that very eternal life, and that Thou givest in Thy flesh and blood only that which Thou art.

(Tr. xxvii. s. 9) For we believed, in order to know. Had we wished first to know, and then to believe, we could never have been able to believe. This we believe, and know, that Thou art the Christ the Son of God; i. e. that Thou art eternal life, and that in Thy flesh and blood Thou givest what Thou art Thyself.

"To whom shall we go? Thou hast the words of eternal life. And we believe and are sure that Thou art the Christ, the Son of the living God." Seest thou that it was not the words that caused offense, but the heedlessness, and sloth, and wrong-mindedness of the hearers? For even had He not spoken, they would have been offended, and would not have ceased to be ever anxious about bodily food, ever nailed to earth. Besides, the disciples heard at the same time with the others, yet they declared an opinion contrary to theirs, saying, "To whom shall we go?" An expression indicating much affection, for it shows that their Teacher was more precious to them than anything, than father or mother, or any possessions, and that if they withdrew from Him, they had not then whither to flee. Then lest it should seem that he had said, "to whom shall we go?" because there were none that would receive them, he straightway added, "Thou hast the words of eternal life." For the Jews listened carnally, and with human reasonings, but the disciples spiritually, and committing all to faith. Wherefore Christ said, "The words which I have spoken unto you are spirit"; that is, "do not suppose that the teaching of My words is subject to the rule of material consequences, or to the necessity of created things. Things spiritual are not of this nature, nor endure to submit to the laws of earth." This also Paul declareth, saying, "Say not in thine heart, Who shall ascend into heaven? (that is, to bring Christ down;) or, Who shall descend into the deep? (that is, to bring up Christ again from the dead.)"

"Thou hast the words of eternal life." These men already admitted the Resurrection, and all the apportionment which shall be there. And observe the brotherly and affectionate man, how he maketh answer for all the band. For he said not, "I know," but, "We know." Or rather, observe how he goes to the very words of his Teacher, not speaking as did the Jews. They said, "This is the son of Joseph"; but he said, "Thou art the Christ, the Son of the living God"; and "Thou hast the words of eternal life"; having perhaps heard Him say, "He that believeth on Me hath eternal life, and I will raise him up at the last day." For he showed that he retained all that had been said, by recalling the very words. What then did Christ? He neither praised nor expressed admiration of Peter, though He had elsewhere done so...