4 What shall I say of such? Look, the Pharisees themselves were in the habit of reading, and in what they read, their voices re-echoed the Christ, they hoped He would come, and recognized Him not when present; they boasted, even they, of being among those who saw, that is, among the wise, and they disowned the Christ, and entered not in by the door. Therefore would such also, if they chanced to seduce any, seduce them to be slaughtered and murdered, not to be brought into liberty. Let us leave these also to themselves, and look at those who glory in the name of Christ Himself, and see whether even they perchance are entering in by the door.
Source: Tractates on the Gospel of John (New Advent)