use the term "principle" even in things which have no such difference, but have only a certain order to each other; as when we say that a point is the principle of a line; or also when we say that the first part of a line is the principle of a line.
Reply to Objection 2: It is the custom with the Greeks to say that the Son and the Holy Ghost are principled. This is not, however, the custom with our Doctors; because, although we attribute to the Father something of authority by reason of His being the principle, still we do not attribute any kind of subjection or inferiority to the Son, or to the Holy Ghost, to avoid any occasion of error. In this way, Hilary says (De Trin. ix): "By authority of the Giver, the Father is the greater; nevertheless the Son is not less to Whom oneness of nature is give."
Reply to Objection 3: Although this word principle, as regards its derivation, seems to be taken from priority, still it does not signify priority, but origin. For what a term signifies, and the reason why it was imposed, are not the same thing, as stated above ( Question [13], Article [8]).
Whether this name "Father" is properly the name of a divine person?
Objection 1: It would seem that this name "Father" is not properly the name of a divine person. For the name "Father" signifies relation. Moreover "person" is an individual substance. Therefore this name "Father" is not properly a name signifying a Person.
Objection 2: Further, a begetter is more common than father; for every father begets; but it is not so conversely. But a more common term is more properly applied to God, as stated above ( Question [13], Article [11]). Therefore the more proper name of the divine person is begetter and genitor than Father.
Objection 3: Further, a metaphorical term cannot be the proper name of anyone. But the word is by us metaphorically called begotten, or offspring; and consequently, he of whom is the word, is metaphorically called father. Therefore the principle of the Word in God is not properly called Father.
Objection 4: Further, everything which is said properly of God, is said of God first before creatures. But generation appears to apply to creatures before God; because generation seems to be truer when the one who proceeds is distinct from the one whence it proceeds, not only by relation but also by essence. Therefore the name "Father" taken from generation does not seem to be the proper name of any divine person.
On the contrary, It is said (Ps. 88:27): "He shall cry out to me: Thou art my Father."
I answer that, The proper name of any person signifies that whereby the person is distinguished from all other persons. For as body and soul belong to the nature of man, so to the concept of this particular man belong this particular soul and this particular body; and by these is this particular man distinguished from all other men. Now it is paternity which distinguishes the person of the Father from all other persons. Hence this name "Father," whereby paternity is signified, is the proper name of the person of the Father.
Reply to Objection 1: Among us relation is not a subsisting person. So this name "father" among us does not signify a person, but the relation of a person. In God, however, it is not so, as some wrongly thought; for in God the relation signified by the name "Father" is a subsisting person. Hence, as above explained ( Question [29], Article [4]), this name "person" in God signifies a relation subsisting in the divine nature.
Reply to Objection 2: According to the Philosopher (De Anima ii, text 49), a thing is denominated chiefly by its perfection, and by its end. Now generation signifies something in process of being made, whereas paternity signifies the complement of generation; and therefore the name "Father" is more expressive as regards the divine person than genitor or begettor.
Reply to Objection 3: In human nature the word is not a subsistence, and hence is not properly called begotten or son. But the divine Word is something subsistent in the divine nature; and hence He is properly and not metaphorically called Son, and His principle is called Father.
Reply to Objection 4: The terms "generation" and "paternity" like the other terms properly applied to God, are said of God before creatures as regards the thing signified, but not as regards the mode of signification. Hence also the Apostle says, "I bend my knee to the Father of my Lord Jesus Christ, from whom all paternity in heaven and on earth is named" (Eph. 3:14). This is explained thus. It is manifest that generation receives its species from the term which is the form of the thing generated; and the nearer it is to the form of the generator, the truer and more perfect is the generation; as univocal generation is more perfect than non-univocal, for it belongs to the essence of a generator to generate what is like itself in form. Hence the very fact that in the divine generation the form of the Begetter and Begotten is numerically the same, whereas in creatures it is not numerically, but only specifically, the same, shows that generation, and consequently paternity, is applied to God before creatures. Hence the very fact that in God a distinction exists of the Begotten from the Begetter as regards relation only, belongs to the truth of the divine generation and paternity.
Whether this name "Father" is applied to God, firstly as a personal name?
Objection 1: It would seem that this name "Father" is not applied to God, firstly as a personal name. For in the intellect the common precedes the particular. But this name "Father" as a personal name, belongs to the person of the Father; and taken in an essential sense it is common to the whole Trinity; for we say "Our Father" to the whole Trinity. Therefore "Father" comes first as an essential name before its personal sense.
Objection 2: Further, in things of which the concept is the same there is no priority of predication. But paternity and filiation seem to be of the same nature, according as a divine person is Father of the Son, and the whole Trinity is our Father, or the creature's; since, according to Basil (Hom. xv, De Fide), to receive is common to the creature and to the Son. Therefore "Father" in God is not taken as an essential name before it is taken personally.
Objection 3: Further, it is not possible to compare things which have not a common concept. But the Son is compared to the creature by reason of filiation or generation, according to Col. 1:15: "Who is the image of the invisible God, the first-born of every creature." Therefore paternity taken in a personal sense is not prior to, but has the same concept as, paternity taken essentially.
On the contrary, The eternal comes before the temporal. But God is the Father of the Son from eternity; while He is the Father of the creature in time. Therefore paternity in God is taken in a personal sense as regards the Son, before it is so taken as regards the creature.
I answer that, A name is applied to that wherein is perfectly contained its whole signification, before it is applied to that which only partially contains it; for the latter bears the name by reason of a kind of similitude to that which answers perfectly to the signification of the name; since all imperfect things are taken from perfect things. Hence this name "lion" is applied first to the animal containing the whole nature of a lion, and which is properly so called, before it is applied to a man who shows something of a lion's nature, as courage, or strength, or the like; and of whom it is said by way of similitude.
Now
