" On the other hand, the lover is in the
beloved, by the love of concupiscence and by the love of friendship,
but not in the same way. For the love of concupiscence is not
satisfied with any external or superficial possession or enjoyment of
the beloved; but seeks to possess the beloved perfectly, by
penetrating into his heart, as it were. Whereas, in the love of
friendship, the lover is in the beloved, inasmuch as he reckons what
is good or evil to his friend, as being so to himself; and his
friend's will as his own, so that it seems as though he felt the good
or suffered the evil in the person of his friend. Hence it is proper
to friends "to desire the same things, and to grieve and rejoice at
the same," as the Philosopher says (Ethic. ix, 3 and Rhet. ii, 4).
Consequently in so far as he reckons what affects his friend as
affecting himself, the lover seems to be in the beloved, as though he
were become one with him: but in so far as, on the other hand, he
wills and acts for his friend's sake as for his own sake, looking on
his friend as identified with himself, thus the beloved is in the
lover.

In yet a third way, mutual indwelling in the love of friendship can
be understood in regard to reciprocal love: inasmuch as friends
return love for love, and both desire and do good things for one
another.

Reply Obj. 1: The beloved is contained in the lover, by being
impressed on his heart and thus becoming the object of his
complacency. On the other hand, the lover is contained in the
beloved, inasmuch as the lover penetrates, so to speak, into the
beloved. For nothing hinders a thing from being both container and
contents in different ways: just as a genus is contained in its
species, and vice versa.

Reply Obj. 2: The apprehension of the reason precedes the movement of
love. Consequently, just as the reason divides, so does the movement
of love penetrate into the beloved, as was explained above.

Reply Obj. 3: This argument is true of the third kind of mutual
indwelling, which is not to be found in every kind of love.
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THIRD ARTICLE [I-II, Q. 28, Art. 3]

Whether Ecstasy Is an Effect of Love?

Objection 1: It would seem that ecstasy is not an effect of love.
For ecstasy seems to imply loss of reason. But love does not always
result in loss of reason: for lovers are masters of themselves at
times. Therefore love does not cause ecstasy.

Obj. 2: Further, the lover desires the beloved to b