Gregory the Great
Catena Aurea · Markusevangelium 16
Mk 16, Verses 19–20English original
So then after the Lord had spoken unto them, he was received up into heaven, and sat on the right hand of God. And they went forth, and preached every where, the Lord working with them, and confirming the word with signs following. Amen.
(ubi sup.) But what should we consider in these words, if it be not that obedience follows the precept and signs follow the obedience? For the Lord had commanded them, Go into all the world preaching the Gospel, and, Ye shall be witnesses even unto the ends of the earth.