Pope Paul VI
Populorum Progressio §87
Populorum Progressio: On the Development of Peoples
87 We bless you with all Our heart, and We call upon all men of good will to join forces with you as a band of brothers. Knowing, as we all do, that development means peace these days, what man would not want to work for it with every ounce of his strength? No one, of course. So We beseech all of you to respond wholeheartedly to Our urgent plea, in the name of the Lord. Given at Rome, at St. Peter's, on the feast of the Resurrection, March 26, 1967, in the fourth year of Our pontificate.
Source: Populorum Progressio (Vatican.va)