Theophylact of Ohrid
Catena Aurea · Johannesevangelium 18
The high priest then asked Jesus of his disciples, and of his doctrine. Jesus answered him, I spake openly to the world; I ever taught in the synagogue, and in the temple, whither the Jews always resort; and in secret have I said nothing. Why askest thou me? ask them which heard me, what I have said unto them: behold, they know what I said.
He refers here to the prophecy of Esaias; I have not spoken in secret, in a dark place of the earth. (Isa. 45:19)