Matthew 10:20

For it is not ye that speak
Not but that they were to speak the words, and did; but then both the things they spoke, and the very words in which they spoke them, were not of themselves, but were suggested and dictated by the Spirit of God; for as "the preparation of the heart" in them, so "the answer of the tongue" by them, were both "from the Lord": the Spirit, he was the efficient cause, they were only instruments; for not they of themselves spoke; or not so much they,

but the Spirit of your father, which speaketh in you,
or "by you": what they should say was not to be dictated by their own spirit or natural understanding, nor by an angel, but by the Spirit of God; called the "Spirit of" their "father", because he proceeds from him, is of the same nature with him, and is the reason of his being given to them: and this character of him might serve to strengthen their faith in the expectation of him, and in the assistance promised, and to be had by him; since he was the spirit of him, who stood in the relation of a father to them, and bore a paternal affection for them.