32 And that Paul was full of the Holy Ghost, and all his fellow Apostles, and they who after them believed in Father, Son, and Holy Ghost, hear from himself as he writes plainly in his Epistles; And my speech, he says, and my preaching was not in persuasive words of man's wisdom, but in demonstration of the Spirit and of power. And again, But He who sealed us for this very purpose is God, who gave us the earnest of the Spirit. And again, He that raised up Jesus from the dead shall also quicken your mortal bodies by His Spirit which dwells in you. And again, writing to Timothy, That good thing which was committed to you guard through the Holy Ghost which was given to us.
Source: Catechetical Lectures (New Advent)