Aquinas on the Love of God
"A lover is placed outside himself, and made to pass into the object of his love, inasmuch as he wills good to the beloved; and works for that good by his providence even as he works for his own. Hence Dionysius says (Div. Nom. iv, 1): "On behalf of the truth we must make bold to say even this, that He Himself, the cause of all things, by His abounding love and goodness, is placed outside Himself by His providence for all existing things."
"Saint Thomas Aquinas, Summa Theologiae I.20.2 ad 1.