Thomas Aquinas

“ God is effectively the life both of the soul by charity, and of the body by the soul: but formally charity is the life of the soul, even as the soul is the life of the body. Consequently we may conclude from this that just as the soul is immediately united to the body, so is charity to the soul. ”

“ 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. ”

“ Every accident is inferior to substance if we consider its being, since substance has being in itself, while an accident has its being in another: but considered as to its species, an accident which results from the principles of its subject is inferior to its subject, even as an effect is inferior to its cause; whereas an accident that results from a participation of some higher nature is superior to its subject, in so far as it is a likeness of that higher nature, even as light is superior to the diaphanous body. ”

“ The ultimate and principal good of man is the enjoyment of God, according to Ps. 72:28: "It is good for me to adhere to God," and to this good man is ordered by charity. Man's secondary and, as it were, particular good may be twofold: one is truly good, because, considered in itself, it can be directed to the principal good, which is the last end; while the other is good apparently and not truly, because it leads us away from the final good. Accordingly it is evident that simply true virtue is that which is directed to man's principal good ”

“ 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. ”

“ Charity is compared to the foundation or root in so far as all other virtues draw their sustenance and nourishment therefrom, and not in the sense that the foundation and root have the character of a material cause. ”

“ This is evident from the fact that not every friendship is praiseworthy and virtuous, as in the case of friendship based on pleasure or utility. Wherefore friendship for the virtuous is something consequent to virtue rather than a virtue. Moreover there is no comparison with charity since it is not founded principally on the virtue of a man, but on the goodness of God. ”

“ Charity is said to be the end of other virtues, because it directs all other virtues to its own end. And since a mother is one who conceives within herself and by another, charity is called the mother of the other virtues, because, by commanding them, it conceives the acts of the other virtues, by the desire of the last end. ”

“ God is loved by charity for His own sake: wherefore charity regards principally but one aspect of lovableness, namely God's goodness, which is His substance, according to Ps. 105:1: "Give glory to the Lord for He is good." Other reasons that inspire us with love for Him, or which make it our duty to love Him, are secondary and result from the first. ”

“ And this is evidently untrue, since no virtue has such a strong inclination to its act as charity has, nor does any virtue perform its act with so great pleasure. Therefore it is most necessary that, for us to perform the act of charity, there should be in us some habitual form superadded to the natural power, inclining that power to the act of charity, and causing it to act with ease and pleasure. ”

“ The virtue or art which is concerned about the last end, commands the virtues or arts which are concerned about other ends which are secondary, thus the military art commands the art of horse-riding (Ethic. i) . Accordingly since charity has for its object the last end of human life, viz. everlasting happiness, it follows that it extends to the acts of a man's whole life, by commanding them, not by eliciting immediately all acts of virtue. ”

“ In this way it is possible for an act, without charity, to be generically good, but not perfectly good, because it lacks its due order to the last end.
Reply to Objection 2: Since the end is in practical matters, what the principle is in speculative matters, just as there can be no strictly true science, if a right estimate of the first indemonstrable principle be lacking, so, there can be no strictly true justice, or chastity, without that due ordering to the end, which is effected by charity, however rightly a man may be affected about other matters. ”

“ The Divine Essence Itself is charity, even as It is wisdom and goodness. Wherefore just as we are said to be good with the goodness which is God, and wise with the wisdom which is God (since the goodness whereby we are formally good is a participation of Divine goodness, and the wisdom whereby we are formally wise, is a share of Divine wisdom) , so too, the charity whereby formally we love our neighbor is a participation of Divine charity. For this manner of speaking is common among the Platonists, with whose doctrines Augustine was imbued ”

“ Therefore charity is imperfect here, but will be perfected in heaven.
Reply to Objection 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. ”

“ Now no act is perfectly produced by an active power, unless it be connatural to that power of reason of some form which is the principle of that action. Wherefore God, Who moves all things to their due ends, bestowed on each thing the form whereby it is inclined to the end appointed to it by Him ”

“ The operation of the intellect is completed by the thing understood being in the intellectual subject, so that the excellence of the intellectual operation is assessed according to the measure of the intellect. ”