2. It represens the Holy Ghost as a Person distinct from the Father and from the Son: 'I will ask the Father, and He shall give you another Paraclete, that He may abide with you for ever, the Spirit of Truth' (John xiv. 16, 17). 'The Holy Ghost descended in a bodily shape, as a dove, upon Him; and a voice came from Heaven: Thou art my beloved Son' (Luke iii. 22, and elsewhere).
Thus also the Catholic Church teaches, and has always taught. As early as in the General Council of Constantinople (A.D., 381) she unanimously condemned the heresy of Macedonius, who denied the Divinity of the Holy Ghost, and she expressly declared 'that the Holy Ghost, the Lord and Giver of life, is adored and glorified together with the Father and the Son.'
4. From whom does the Holy Ghost proceed?
The Holy Ghost proceeds from the Father and the Son, as from one source.
'I will send you the Spirit of Truth, who proceedeth from the Father'; 'He shall receive of mine' (John xv. 26, and xvi. 15).
5. Why is the 'Third' Person of the Blessed Trinity in particular named the 'Holy Spirit,' since the name of 'Spirit' and 'Holy' equally belongs to the 'First' and to the 'Second' Person?
The Third Person is in particular called the 'Holy Spirit,' because to Him is especially ascribed the work of our sanctification, and He imparts to us the spiritual life of grace.
Hence the Third Person is also called the 'Sanctifier' and 'Giver of Life.'
6. Why is the work of our sanctification especially ascribed to the Holy Ghost?
Because He, as the Spirit of Love, is the Giver of all inward holiness, and the Dispenser of all supernatural gifts and graces, whereby we are sanctified.
It is true, the work of our sanctification is common to all the three Divine Persons; nevertheless, as a work of love it has a special relation to the Holy Ghost—the Spirit of Love.
7. But is it not Jesus Christ, our Redeemer, who sanctifies us?
Jesus Christ sanctifies us, inasmuch as He has merited and prepared for us the grace which makes us pleasing
