Augustine of Hippo — as excerpted in the Catena Aurea on John 6:60-71

“(Tr. xxvii. 8) And perhaps this took place for our consolation; since it sometimes happens that a man says what is true, and what He says is not understood, and they which hear are offended and go. Then the man is sorry he spoke what was true; for he says to himself, I ought not to have spoken it; and yet our Lord was in the same case. He spoke the truth, and destroyed many. But He is not disturbed at it, because He knew from the beginning which would believe. We, if this happens to us, are disturbed. Let us desire consolation then from our Lord’s example; and withal use caution in our speech.”