The Holy Spirit

The Holy Spirit, the third Person in the Trinity, proceeding from the Father and the Son, of the same substance and equal in power and glory, is, together with the Father and the Son, to be believed in, loved, obeyed, and worshipped throughout all ages.

He is the Lord and Giver of life, everywhere present, and is the source of all good thoughts, pure desires, and holy counsels in men. By him the prophets were moved to speak the Word of God, and all the writers of the Holy Scriptures inspired to record infallibly the mind and will of God.

Westminster Confession of Faith
IX The Holy Spirit