Pope John XXIII
Mater et Magistra §3
Mater et Magistra: On Christianity and Social Progress
3 Hence, though the Church's first care must be for souls, how she can sanctify them and make them share in the gifts of heaven, she concerns herself too with the exigencies of man's daily life, with his livelihood and education, and his general, temporal welfare and prosperity.
Source: Mater et Magistra (Vatican.va)