John Chrysostom — as excerpted in the Catena Aurea on John 14:18-21

“(Hom. lxxv. 2) Or, in that day, on which I shall rise again, ye shall know. For His resurrection it was that established their faith. Then the powerful teaching of the Holy Spirit began. His saying, I am in the Father, expresses His humility; the next, And ye in Me, and I in you, His humanity and God’s assistance to Him. Scripture often uses the same words in different senses, as applied to God and to men.”