CCC 1766 “To love is to will the good of another.”¹ All other affections have their source in this first movement of the human heart toward the good. Only the good can be loved.² Passions “are evil if love is evil and good if it is good.”³

1 St. Thomas Aquinas, STh I-II, 26, 4, corp. art.
2 Cf. St. Augustine, De Trin., 8, 3, 4: PL 42, 949-950.
3 St. Augustine, De civ. Dei 14, 7, 2: PL 41, 410.