Pacem, Dei Munus Pulcherrimum §9

⁹ Christian charity ought not to be content with not hating our enemies and loving them as brothers; it also demands that we treat them with kindness, following the rule of the Divine Master Who "went about doing good and healing all that were oppressed by the devil", and finished His mortal life, the course of which was marked by good deeds, by shedding His blood for them. So said St. John: "In this we have known the charity of God, because He hath laid down His life for us, and we ought to lay down our lives for the brethren. He that hath substance of this world and shall see his brother in need and shall shut up his bowels from him: how doth the charity of God abide in him? My little children, let us love not in word nor by tongue, but in deed and in truth."