33 And that the Holy Ghost subsists, and lives, and speaks, and foretells, I have often said in what goes before, and Paul writes it plainly to Timothy: Now the Spirit speaks expressly, that in later times some shall depart from the faith —which we see in the divisions not only of former times but also of our own; so motley and diversified are the errors of the heretics. And again the same Paul says, Which in other generations was not made known unto the sons of men, as it has now been revealed unto His Holy Apostles and Prophets in the Spirit. And again, Wherefore, as says the Holy Ghost; and again, The Holy Ghost also witnesses to us. And again he calls unto the soldiers of righteousness, saying, And take the helmet of salvation, and the sword of the Spirit, which is the Word of God, with all prayer and supplication. And again, Be not drunk with wine, wherein is excess; but be filled with the Spirit, speaking to yourselves in psalms, and hymns, and spiritual songs. And again, The grace of the Lord Jesus, and the love of God, and the communion of the Holy Ghost be with you all.
Source: Catechetical Lectures (New Advent)