Reply Obj. 1: Man's life is twofold. There is his outward life in respect of his sensitive and corporeal nature: and with regard to this life there is no communication or fellowship between us and God or the angels. The other is man's spiritual life in respect of his mind, and with regard to this life there is fellowship between us and both God and the angels, imperfectly indeed in this present state of life, wherefore it is written (Phil. 3:20): "Our conversation is in heaven." But this "conversation" will be perfected in heaven, when "His servants shall serve Him, and they shall see His face" (Apoc. 22:3, 4). Therefore charity is imperfect here, but will be perfected in heaven.
Reply Obj. 2: Friendship extends to a person in two ways: first in respect of himself, and in this way friendship never extends but to one's friends: secondly, it extends to someone in respect of another, as, when a man has friendship for a certain person, for his sake he loves all belonging to him, be they children, servants, or connected with him in any way. Indeed so much do we love our friends, that for their sake we love all who belong to them, even if they hurt or hate us; so that, in this way, the friendship of charity extends even to our enemies, whom we love out of charity in relation to God, to Whom the friendship of charity is chiefly directed.
Reply Obj. 3: The friendship that is based on the virtuous is directed to none but a virtuous man as the principal person, but for his sake we love those who belong to him, even though they be not virtuous: in this way charity, which above all is friendship based on the virtuous, extends to sinners, whom, out of charity, we love for God's sake. _______________________
SECOND ARTICLE [II-II, Q. 23, Art. 2]
Whether Charity Is Something Created in the Soul?
Objection 1: It would seem that charity is not something created in the soul. For Augustine says (De Trin. viii, 7): "He that loveth his neighbor, consequently, loveth love itself." Now God is love. Therefore it follows that he loves God in the first place. Again he says (De Trin. xv, 17): "It was said: God is Charity, even as it was said: God is a Spirit." Therefore charity is not something created in the soul, but is God Himself.
Obj. 2: Further, God is the life of the soul spiritually just as the soul is the life of the body, according to Deut. 30:20: "He is thy life." Now the soul by itself quickens the body. Therefore God quickens the soul by Himself. But He quickens it by charity, according to 1 John 3:14: "We know that we have passed from death to life, because we love the brethren." Therefore God is charity itself.
Obj. 3: Further, no created thing is of infinite power; on the contrary every creature is vanity. But charity is not vanity, indeed it is opposed to vanity; and it is of infinite power, since it brings the human soul to the infinite good. Therefore charity is not something created in the soul.
On the charity, Augustine says (De Doctr. Christ. iii, 10): "By charity I mean the movement of the soul towards the enjoyment of God for His own sake." But a movement of the soul is something created in the soul. Therefore charity is something created in the soul.
I answer that, The Master looks thoroughly into this question in Q. 17 of the First Book, and concludes that charity is not something created in the soul, but is the Holy Ghost Himself dwelling in the mind. Nor does he mean to say that this movement of love whereby we love God is the Holy Ghost Himself, but that this movement is from the Holy Ghost without any intermediary habit, whereas other virtuous acts are from the Holy Ghost by means of the habits of other virtues, for instance the habit of faith or hope or of some other virtue: and this he said on account of the excellence of charity.