Remigius of Auxerre
Catena Aurea · Matthäusevangelium 10
But when they deliver you up, take no thought how or what ye shall speak: for it shall be given you in that same hour what ye shall speak. For it is not ye that speak, but the Spirit of your Father which speaketh in you.
(ap. Raban.) Meaning, Ye indeed go out to the battle, but it is I who fight; you utter the words, but it is I who speak. Hence Paul speaks, Seek ye a proof of Christ who speaketh in me? (2 Cor. 13:3.)