He did this when He was alone with them, away from the crowd of others. For then He explained to them the parables that He told others while leaving them obscure.
What, then, does "I have said nothing in secret" mean? His words, "I have spoken openly to the world," should be understood as though He said, "Many have heard Me."
This very "openly" was, in one sense, open, and in another sense not open. It was open, because many heard.
On the other hand, it was not open, because many did not understand. And whatever He said separately to His disciples, He did not say secretly.
For who speaks secretly when speaking before such a multitude of people? It is written: "By the testimony of two witnesses, or by the testimony of three witnesses, a matter shall be established" (Deut 19:15).
How much more is this so if He spoke to a few what He wished to reveal to many through them.
The Lord Himself says to those few who were near Him: "What I tell you in the dark, speak in the light; and what you hear in the ear, preach on the housetops" (Mt 10:27).
Therefore the very thing that seemed to be spoken by Him in a hidden way was, in some sense, not spoken as a secret.
For He did not speak so that those to whom it was said should keep silence. Rather, He spoke so that it would be preached everywhere.
Thus something can be said openly and yet not openly, or secretly and yet not as a secret. For it is said: "so that seeing they may see and not perceive" (cf. Mk 4:12).
Why do they "see," if not because it is open and not secret? And again, why do these same people "not perceive," if not because it is not open, but hidden?
Yet the very thing that men heard and did not understand was such that it could not truly become grounds for accusing Him of a crime.
Whenever they questioned Him, trying to find something with which to accuse Him, He answered in such a way that all their traps were destroyed and their schemes frustrated.
For this reason He said: "Why do you ask Me? Ask those who have heard what I said to them; behold, they know what I said."