John 20:21
“As My Father has sent Me, so send I you.”
“You have no difficulty, owing to what has already come to pass, and to the dignity of Me who send you.” Here He lifts up their souls, and shows them their great cause of confidence, if so be that they were about to undertake His work. And no longer is an appeal made to the Father, but with authority He gives to them the power. For,
Source: Homilies on the Gospel of John (New Advent)