Whether union is an effect of love?

Objections

Objection 1 : It would seem that union is not an effect of love. For absence is incompatible with union. But love is compatible with absence; for the Apostle says (Gal. 4:18): "Be zealous for that which is good in a good thing always" (speaking of himself, according to a gloss), "and not only when I am present with you." Therefore union is not an effect of love.
Objection 2 : Further, every union is either according to essence, thus form is united to matter, accident to subject, and a part to the whole, or to another part in order to make up the whole: or according to likeness, in genus, species, or accident. But love does not cause union of essence; else love could not be between things essentially distinct. On the other hand, love does not cause union of likeness, but rather is caused by it, as stated above (Question [27], Article [3]). Therefore union is not an effect of love.
Objection 3 : Further, the sense in act is the sensible in act, and the intellect in act is the thing actually understood. But the lover in act is not the beloved in act. Therefore union is the effect of knowledge rather than of love.