Augustine of Hippo — as excerpted in the Catena Aurea on John 14:18-21

“(Tr. lxxv. 1) That no one might think, because our Lord was about to give the Holy Spirit, that He would therefore not be present Himself in Him, He adds, I will not leave you comfortless. The Greek word ὀρφανοὶ signifies “wards.” Although then the Son of God has made us the adopted sons of the Father, yet here He Himself shews the affection of a Father towards us.”