Reply to Objection 1: Not all love of choice is rational love, according as rational is distinguished from intellectual love. For rational love is so called which follows deductive knowledge: but, as was said above (Q[59], A[3], ad 1), when treating of free-will, every choice does not follow a discursive act of the reason; but only human choice. Consequently the conclusion does not follow.
The reply to the second objection follows from what has been said.
Whether the angel loves himself with both natural love, and love of choice?
Objection 1: It would seem that the angel does not love himself both with natural love and a love of choice. For, as was said (A[2]), natural love regards the end itself; while love of choice regards the means to the end. But the same thing, with regard to the same, cannot be both the end and a means to the end. Therefore natural love and the love of choice cannot have the same object.
Objection 2: Further, as Dionysius observes (Div. Nom. iv): "Love is a uniting and a binding power." But uniting and binding imply various things brought together. Therefore the angel cannot love himself.
Objection 3: Further, love is a kind of movement. But every movement tends towards something else. Therefore it seems that an angel cannot love himself with either natural or elective love.
On the contrary, The Philosopher says (Ethic. ix, 8): "Love for others comes of love for oneself."
I answer that, Since the object of love is good, and good is to be found both in substance and in accident, as is clear from Ethic. i, 6, a thing may be loved in two ways; first of all as a subsisting good; and secondly as an accidental or inherent good. That is loved as a subsisting good, which is so loved that we wish well to it. But that which we wish unto another, is loved as an accidental or inherent good: thus knowledge is loved, not that any good may come to it but that it may be possessed. This kind of love has been called by the name "concupiscence" while the first is called "friendship."
Now it is manifest that in things devoid of knowledge, everything naturally seeks to procure what is good for itself; as fire seeks to mount upwards. Consequently both angel and man naturally seek their own good and perfection. This is to love self. Hence angel and man naturally love self, in so far as by natural appetite each desires what is good for self. On the other hand, each loves self with the love of choice, in so far as from choice he wishes for something which will benefit himself.
Reply to Objection 1: It is not under the same but under quite different aspects that an angel or a man loves self with natural and with elective love, as was observed above.
Reply to Objection 2: As to be one is better than to be united, so there is more oneness in love which is directed to self than in love which unites one to others. Dionysius used the terms "uniting" and "binding" in order to show the derivation of love from self to things outside self; as uniting is derived from unity.
Reply to Objection 3: As love is an action which remains within the agent, so also is it a movement which abides within the lover, but does not of necessity tend towards something else; yet it can be reflected back upon the lover so that he loves himself; just as knowledge is reflected back upon the knower, in such a way that he knows himself.
Whether an angel loves another with natural love as he loves himself?
Objection 1: It would seem that an angel does not love another with natural love as he loves himself. For love follows knowledge. But an angel does not know another as he knows himself: because he knows himself by his essence, while he knows another by his similitude, as was said above (Q[56], AA[1],2). Therefore it seems that one angel does not love another with natural love as he loves himself.
Objection 2: Further, the cause is more powerful than the effect; and the principle than what is derived from it. But love for another comes of love for self, as the Philosopher says (Ethic. ix, 8). Therefore one angel does not love another as himself, but loves himself more.
Objection 3: Further, natural love is of something as an end, and is unremovable. But no angel is the end of another; and again, such love can be severed from him, as is the case with the demons, who have no love for the good angels. Therefore an angel does not love another with natural love as he loves himself.
On the contrary, That seems to be a natural property which is found in all, even in such as devoid of reason. But, "every beast loves its like," as is said, Ecclus. 13:19. Therefore an angel naturally loves another as he loves himself.
I answer that, As was observed (A[3]), both angel and man naturally love self. Now what is one with a thing, is that thing itself: consequently every thing loves what is one with itself. So, if this be one with it by natural union, it loves it with natural love; but if it be one with it by non-natural union, then it loves it with non-natural love. Thus a man loves his fellow townsman with a social love, while he loves a blood relation with natural affection, in so far as he is one with him in the principle of natural generation.
Now it is evident that what is generically or specifically one with another, is the one according to nature. And so everything loves another which is one with it in species, with a natural affection, in so far as it loves its own species. This is manifest even in things devoid of knowledge: for fire has a natural inclination to communicate its form to another thing, wherein consists this other thing's good; as it is naturally inclined to seek its own good, namely, to be borne upwards.
So then, it must be said that one angel loves another with natural affection, in so far as he is one with him in nature. But so far as an angel has something else in common with another angel, or differs from him in other respects, he does not love him with natural love.
Reply to Objection 1: The expression 'as himself' can in one way qualify the knowledge and the love on the part of the one known and loved: and thus one angel knows another as himself, because he knows the other to be even as he knows himself to be. In another way the expression can qualify the knowledge and the love on the part of the knower and lover. And thus one angel does not know another as himself, because he knows himself by his essence, and the other not by the other's essence. In like manner he does not love another as he loves himself, because he loves himself by his own will; but he does not love another by the other's will.
Reply to Objection 2: The expression "as" does not denote equality, but likeness. For since natural affection rests upon natural unity, the angel naturally loves less what is less one with him. Consequently he loves more what is numerically one with himself, than what is one only generically or specifically. But it is natural for him to have a like love for another as for himself, in this respect, that as he loves self in wishing well to self, so he loves another in wishing well to him.
Reply to Objection 3: Natural love is said to be of the end, not as of that end to which good is willed, but rather as of that good which one wills for oneself, and in consequence for another, as united to oneself. Nor can such natural love be stripped from the wicked angels, without their still retaining a natural affection towards the good angels, in so far as they share the same nature with them. But they hate them, in so far as they are unlike them according to righteousness and unrighteousness.
Whether an angel by natural love loves God more than he loves himself?
Objection 1: It would seem that the angel does not love God by natural love more than he loves himself. For, as was stated (A[4]), natural love rests upon natural union. Now the Divine nature is far above the angelic nature. Therefore, according to natural love, the angel loves God less than self, or even than another angel.