Mutua inhaesio intelligi in amore amicitiae, secundum viam redamationis, inquantum mutuo se amant amici, et sibi invicem bona volunt et operantur, quia eadem ratione, quilibet amor facit amatum esse in amante, et e converso.
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, because by the same formal aspect, every love makes the beloved to be in the lover, and vice versa.
Iste effectus mutuae inhaesionis potest intelligi et quantum ad vim apprehensivam, et quantum ad vim appetitivam. Nam quantum ad vim apprehensivam amatum dicitur esse in amante, inquantum amatum immoratur in apprehensione amantis.
This effect of mutual indwelling may be understood as referring both to the apprehensive and to the appetitive power. Because, as to the apprehensive power, the beloved is said to be in the lover, inasmuch as the beloved abides in the apprehension of the love.
Sed quantum ad vim appetitivam, amatum dicitur esse in amante, prout est per quandam complacentiam in eius affectu, ut vel delectetur in eo, aut in bonis eius, apud praesentiam; vel in absentia, per desiderium tendat in ipsum amatum per amorem concupiscentiae, vel in bona quae vult amato, per amorem amicitiae: non quidem ex aliqua extrinseca causa (sicut cum aliquis desiderat aliquid propter alterum, vel cum aliquis vult bonum alteri propter aliquid aliud) sed propter complacentiam amati interius radicatam. Unde et amor dicitur intimus; et dicuntur viscera caritatis.
As the appetitive power, the object loved is said to be in the lover, inasmuch as it is in his affections, by a kind of fitting pleasure, causing him either to take pleasure in it, or in its good, when present; or, in the absence of the object loved, by his longing, to tend towards it with the love of concupiscence, or towards the good that he wills to the beloved, with the love of friendship: not indeed from any extrinsic cause (as when we desire one thing on account of another, or wish good to another on account of something else), but because the fitting pleasure in the beloved is rooted in the lover's heart. For this reason we speak of love as being "intimate"; and "of the bowels of charity."