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Obj. 3: Further, because the Son is the name of a divine Person He cannot be called the Son of this or of that. But the spirit is spoken of as of this or that man, as appears in the words, "The Lord said to Moses, I will take of thy spirit and will give to them" (Num. 11:17) and also "The Spirit of Elias rested upon Eliseus" (4 Kings 2:15). Therefore "Holy Ghost" does not seem to be the proper name of a divine Person.
_On the contrary,_ It is said (1 John 5:7): "There are three who bear witness in heaven, the Father, the Word, and the Holy Ghost." As Augustine says (De Trin. vii, 4): "When we ask, Three what? we say, Three persons." Therefore the Holy Ghost is the name of a divine person.
_I answer that,_ While there are two processions in God, one of these, the procession of love, has no proper name of its own, as stated above (Q. 27, A. 4, ad 3). Hence the relations also which follow from this procession are without a name (Q. 28, A. 4): for which reason the Person proceeding in that manner has not a proper name. But as some names are accommodated by the usual mode of speaking to signify the aforesaid relations, as when we use the names of procession and spiration, which in the strict sense more fittingly signify the notional acts than the relations; so to signify the divine Person, Who proceeds by way of love, this name "Holy Ghost" is by the use of scriptural speech accommodated to Him. The appropriateness of this name may be shown in two ways. Firstly, from the fact that the person who is called "Holy Ghost" has something in common with the other Persons. For, as Augustine says (De Trin. xv, 17; v, 11), "Because the Holy Ghost is common to both, He Himself is called that properly which both are called in common. For the Father also is a spirit, and the Son is a spirit; and the Father is holy, and the Son is holy." Secondly, from the proper signification of the name. For the name spirit in things corporeal seems to signify impulse and motion; for we call the