Jamieson, Fausset and Brown on John 14:22

22. Judas saith ... not Iscariot--Beautiful parenthesis this! The traitor being no longer present, we needed not to be told that this question came not from him. But it is as if the Evangelist had said, "A very different Judas from the traitor, and a very different question from any that he would have put. Indeed [as one in Stier says], we never read of Iscariot that he entered in any way into his Master's words, or ever put a question even of rash curiosity (though it may be he did, but that nothing from him was deemed fit for immortality in the Gospels but his name and treason)."

how ... manifest thyself to us, and not to the world--a most natural and proper question, founded on Joh 14:19, though interpreters speak against it as Jewish.