John 16:19

And Jesus perceived that they were desirous to ask him, and he said unto them, Do ye inquire among yourselves concerning this, that I said, A little while, and ye behold me not, and again a little while, and ye shall see me?

Of great significance is the revelation here that Jesus knew exactly what was in the minds and conversations of the apostles, whether or not they were physically in his presence. His repeating their exact words, not having heard them, was a marvelous demonstration of his divine power; and it made a profound impression on the apostles who responded by declaring, "Now we know that thou knowest all things" (John 16:30).