Pope Pius XII
Mystici Corporis Christi §15
Mystici Corporis Christi: On the Mystical Body of Christ
15 But a body calls also for a multiplicity of members, which are linked together in such a way as to help one another. And as in the body when one member suffers, all the other members share its pain, and the healthy members come to the assistance of the ailing, so in the Church the individual members do not live for themselves alone, but also help their fellows, and all work in mutual collaboration for the common comfort and for the more perfect building up of the whole Body.
Source: Mystici Corporis Christi (Vatican.va)