Pope Francis
Fratelli Tutti §60
Fratelli Tutti: On Fraternity and Social Friendship
60 In the New Testament, Hillel’s precept was expressed in positive terms: “In everything, do to others as you would have them do to you; for this is the law and the prophets” ( Mt 7:12). This command is universal in scope, embracing everyone on the basis of our shared humanity, since the heavenly Father “makes his sun rise on the evil and on the good” ( Mt 5:45). Hence the summons to “be merciful, just as your Father is merciful” ( Lk 6:36).
Source: Fratelli Tutti (Vatican.va)