John Calvin Commentary John 16:28

"I came out from the Father, and am come into the world: again, I leave the world, and go unto the Father." — John 16:28 (ASV)

I came out from the Father. This way of speaking draws our attention to the Divine power that is in Christ. Our faith in him would not be steady if it did not perceive his Divine power; for his death and resurrection, the two pillars of faith, would be of little benefit to us if heavenly power were not connected with them. We now understand how we should love Christ. Our love should be of such a nature that our faith is to contemplate the purpose and power of God, by whose hand he is offered to us. For we must not receive coldly the statement that he came out from God, but must also understand for what reason and for what purpose he came out, namely, that he might be to us wisdom, and righteousness, and sanctification, and redemption (1 Corinthians 1:30).

Again, I leave the world, and go to the Father. By this second clause he points out to us that this power is perpetual, because the disciples might have thought that it was a temporary blessing, that he was sent into the world to be a Redeemer. He therefore said that he returns to the Father, so that they might be fully persuaded that none of those blessings that he brought are lost by his departure, because from his heavenly glory he sheds on the world the power and efficacy of his death and resurrection. He therefore left the world when, laying aside our weaknesses, he was received into heaven; but his grace toward us still remains in full force, because he is seated at the right hand of the Father, so that he may sway the scepter of the whole world.