Charles Ellicott Commentary John 14:4

"And whither I go, ye know the way." — John 14:4 (ASV)

And whither I go ye know, and the way ye know. The better reading is, And whither I go, ye know the way, that is, “You know that I am the way to the Father, where I am going.” (Compare John 14:6 and John 13:33.)

They did not, indeed, fully know this, but the means of knowing it was within their reach, and His own words had declared it. (Compare, for example,John 10:1 and John 11:25.) They ought to have known it, and His words now are meant to contrast what they ought to have known with what they really did know, in order that He may more fully instruct them.

To know our ignorance is the first step to its removal.