Pope John XXIII
Pacem in Terris §121
Pacem in Terris: On Establishing Universal Peace in Truth, Justice, Charity, and Liberty
121 All men are united by their common origin and fellowship, their redemption by Christ, and their supernatural destiny. They are called to form one Christian family. In Our encyclical Mater et Magistra , therefore, We appealed to the more wealthy nations to render every kind of assistance to those States which are still in the process of economic development. (61)
Source: Pacem in Terris (Vatican.va)