This parable spoke Jesus unto them: but they understood not what things they were which he spoke unto them.
All Commentaries on John 10:6 Go To John 10
Cyril of Alexandria
AD 444
Simple is the language of the saints, and far removed from the elaborateness of the Greeks: for God chose the foolish things of the world, according to the word of Paul, that He might put to shame them that are wise. He used therefore the name of proverb, for thus he designates the parable, perhaps because the distinction of the two words was always somewhat confused, and the signification is understood equally well whether both or either be used. Yet this we do say, that the inspired Evangelist marvels much at the Jews' want of understanding. For as the experience of events itself bears witness, they have a mind like to rocks or to iron, persistently refusing to accept any profitable instruction of any sort. Wherefore it was said to them by the voice of Joel the Prophet: Rend your hearts and not your garments.
And again, the writer of the Book seems to me not inconsiderately to have said: This parable spake Jesus unto them: but they understood not, he says, what things they were which He spake unto them; and he utters this with no little emphasis. For it is just the same as if he said plainly: So far are the Pharisees from being able to understand any necessary matter, although absurdly wise in their own conceits, that they understood not this parable, so clear to see, and so transparent, in which there is nothing hard to lay hold of, or tortuous to follow, or difficult to comprehend. And with propriety he mocks at the ill counsel of the Jews, since Christ appeared of no account to them, although He taught what was higher than the Law, and exhibited a system of instruction much more pleasing than that of Moses.