Jacopone of Todi: True charity loves God even when He does not grant our requests, and loves others just as much when they offend us

Source: Google Books

Jacopone of Todi (d. 1306):

I cannot know with certainty whether I am in charity; nevertheless, I can have some indications of it. Here is a proof of the love of God within me: if, after asking something of God and He does not grant it to me, I love Him even more than before; if, by granting me the opposite of what I desired, I love Him twice as much as I had done up to that point.

As for love of neighbor, the sign is not to love him any less when he has offended me; if I loved him less, it would be proof that I did not love him before, but that I loved myself. I must love my neighbor for his own sake and not for mine, love his good, his advantage, and rejoice in it. By acting in this way, I draw greater profit from his good than he himself does.