And whither I go you know. As we need no ordinary fortitude, that we may patiently endure to be so long separated from Christ, he adds another confirmation, that the disciples know that his death is not a destruction, but a passage to the Father; and next, that they know the way which they must follow, that they may arrive at the participation of the same glory. Both clauses ought to be carefully observed. First, we must see Christ, by the eyes of faith, in the heavenly glory and a blessed immortality; and, secondly, we ought to know that he is the first-fruits of our life, and that the way which was closed against us has been opened by him.

Whither I go ye know - He had so often told them that he was to die, and rise, and ascend to heaven, that they could not but understand it, Matthew 16:21; Luke 9:22; Luke 18:31-32.
The way ye know - That is, the way that leads to the dwelling-place to which he was going. The way which they were to tread was to obey his precepts, imitate his example, and follow him, John 14:6.

And whither I go ye know - I have told you this so often and so plainly that ye must certainly have comprehended what I have said.

(3) And whither I go ye know, and the way ye know.
(3) Christ alone is the way to true and everlasting life, for it is he in whom the Father has revealed himself.

And whither I go ye know,.... They might have known, at least, whither he was going, since he had spoke of his Father's house, and of his going to prepare a place for them there, and doubtless had some knowledge thereof, though very confused and imperfect:
and the way ye know: this also they might have known from some expressions of his, that the way to his Father's house lay through sufferings and death, in which way they also were to follow him to his kingdom and glory. Though these words may be with an interrogation, "and whither I go do ye know? and the way do ye know?" which best agrees with Thomas's answer, and removes all appearance of contradiction between Christ's words and his.

whither I go ye know . . . Thomas saith, Lord, we know not whither thou guest . . . Jesus saith, I am the way, &c.--By saying this, He meant rather to draw out their inquiries and reply to them. Christ is "THE WAY" to the Father--"no man cometh unto the Father but by Me"; He is "THE TRUTH" of all we find in the Father when we get to Him, "For in Him dwelleth all the fulness of the Godhead bodily" (Colossians 2:9), and He is all "THE LIFE" that shall ever flow to us and bless us from the Godhead thus approached and thus manifested in Him--"this is the true God and eternal life" (1-John 5:20).

The way - Of faith, holiness, sufferings.