John 18:21 Meaning

19The high priest then asked Jesus of his disciples, and of his doctrine.

20Jesus 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.

21Why askest thou me? ask them which heard me, what I have said unto them: behold, they know what I said.

22And when he had thus spoken, one of the officers which stood by struck Jesus with the palm of his hand, saying, Answerest thou the high priest so?

23Jesus answered him, If I have spoken evil, bear witness of the evil: but if well, why smitest thou me?