140 Life without fraternal gratuitousness becomes a form of frenetic commerce, in which we are constantly weighing up what we give and what we get back in return. God, on the other hand, gives freely, to the point of helping even those who are unfaithful; he “makes his sun rise on the evil and on the good” ( Mt 5:45). There is a reason why Jesus told us: “When you give alms, do not let your right hand know what your left hand is doing, so that your alms may be in secret” ( Mt 6:3-4). We received life freely; we paid nothing for it. Consequently, all of us are able to give without expecting anything in return, to do good to others without demanding that they treat us well in return. As Jesus told his disciples: “Without cost you have received, without cost you are to give” ( Mt 10:8).
Source: Fratelli Tutti (Vatican.va)