Catechism of the Catholic Church

2043 and 2045

Because they are members of the Body whose Head is Christ, Christians contribute to building up the Church by the constancy of their convictions and their moral lives. The Church increase, grows, and develops through the holiness of her faithful, until “we all attain to the unity of the faith and of the knowledge of the Son of God, to mature manhood, to the measure of the stature of the fullness of Christ.”

The faithful also have the duty of providing for the material needs of the Church, each according to his abilities.