Jesus answered him,
I spoke openly to the world; I always taught in the synagogue, and in the temple, where the Jews always met; and in secret have I said nothing.
Read Chapter 18
Cyril of Alexandria
AD 444
It were fruitless labour, Christ says, to search out as obscure what is universally known; and how can it be seemly, where full knowledge is present, to set up a pretence of ignorance? This is what Christ seems to us to say, with the object of releasing Himself from the charges that had been fabricated and maliciously devised against Him by the malice of the leaders of the people. But I think, also, that there is a suggestion of another meaning. For He says: I have spoken openly to the world; that is to say, the utterances given to you by the mediation of Moses come in types and shadows, and do not teach expressly the Will of God, but rather create a vision of the actual truth beyond themselves, and, wrapped up in the obscurity of the letter, do not completely reveal the knowledge of those things which are needful for us. I have spoken openly to the world; and, apart from riddles, and the shadow, as it were, of the form of that which is good, I set before you the right, and pointed out...
What then, said He nothing in secret? He did, but not, as they thought, from fear, and to make conspiracies, but if at any time His sayings were too high for the hearing of the many.