“And now I have told you before it come to pass, that, when it is come to pass, ye might believe.”
John 14:29 — Greek Interlinear
Church Fathers on John 14:29
After saying, Peace I leave with you, which was like taking farewell, He consoles them: Let not your heart be troubled, neither let it be afraid: the two feelings of love and fear were now the uppermost in them.
Though He was only going for a time, their hearts would be troubled and afraid for what might happen before He returned; lest in the absence of the Shepherd the wolf might attack the flock: you have heard how I said to you, I go away, and come again to you. In that He was man, He went; in that He was God, He stayed. Why then be troubled and afraid, when He left the eye only, not the heart? To make them understand that it was as man that He said, I go away, and come again to…
If the Father is greater by virtue of giving, is the Son less by confessing the gift? The giver is the greater, but He to whom unity with that giver is given, is not the less.