For it is not you that speak, but the Spirit of your Father who speaks through you.
Read Chapter 10
Augustine of Hippo
To be sure, we heard in that reading, “But when they deliver you up, do not be anxious how or what you are to speak … for it is not you who are speaking but the Spirit of your Father who speaks through you.” And he says in another place: “Behold, I am with you always, even to the end of the world.” Does this mean that the people who heard those words of the Lord would be here until the end of the world? The Lord was referring, rather, not only to those about to depart from this life but also to the others, including us and those who would come after us in this life. He saw everyone in his single body, and the words he spoke, “I am with you even to the end of the world,” were heard by them and by us too. And if we did not hear them then in our knowledge, we heard them in his foreknowledge. Therefore, safe as sheep among the wolves, let us keep the commandments of him who directs us. And let us be “innocent as doves but cautious as snakes.” Innocent as doves that we may not harm anyone; ...
For our faith, observing all the precepts of the Divine will, will be instructed with an answer according to knowledge, after the example of Abraham, to whom when he had given up Isaac, there was not wanting a ram for a victim. "For it is not ye who speak, but the Spirit of your Father that speaketh in you.”
When then we are brought before judges for Christ’s sake, we ought to offer only our will for Christ. But Christ who dwelleth in us speaks for Himself, and the grace of the Holy Spirit will minister in our answer.
For lest they should say, How shall we be able to persuade men, when such things are taking place? He bids them be confident as to their defense also. And elsewhere indeed He says, I will give you a mouth and wisdom; Luke 21:15 but here, It is the Spirit of your Father that speaks in you, advancing them unto the dignity of the prophets. Therefore, when He had spoken of the power that was given, then He added also the terrors, the murders, and the slaughters.
To the foregoing topics of consolation, He adds another not a little one; that they should not say, How shall we be able to persuade such men as these, when they shall persecute us? He bids them be of good courage respecting their answer, saying, “When they shall deliver you up, take no thought how or what yes hall speak.”.
Thus He raises them to the dignity of the Prophets, who have spoken by the Spirit of God. He who says here, “Take no thought what ye shall speak,” has said in another place, “Be ye always ready to give an answer to him thatdemandeth a reason of the hope that is in you.” When it is a dispute among friends, we are commanded to “be ready;” but before the awful judgment, and the raging people, aid is ministered by Christ, that they may speak boldly and notbe dismayed.
. So that the disciples might not ask, "And how shall we who are ordinary people convince the wise?" He bids them to take courage and not be anxious. For when we intend to converse with believers we must study beforehand and be ready to give an answer, as Peter exhorts us (I Peter 3:15). But when we are caught between the crowds and the raging kings, He promises His own strength, so that we may not be afraid. It is for us to confess, but it is God Who will enable us to answer wisely. So that you not imagine that skill in such defense is a natural one, He says, "It is not ye that speak, but the Spirit."