Pope John XXIII
Mater et Magistra §180
Mater et Magistra: On Christianity and Social Progress
180 Moreover, in becoming as it were the life-blood of these people, the Church is not, nor does she consider herself to be, a foreign body in their midst. Her presence brings about the rebirth, the resurrection, of each individual in Christ; and the man who is reborn and rises again in Christ never feels himself constrained from without. He feels himself free in the very depth of his being, and freely raised up to God. And thus he affirms and develops that side of his nature which is noblest and best.
Source: Mater et Magistra (Vatican.va)