11 In fact, even then, as you well know, it will be entirely necessary for your Christian community, if it wishes to be part of the society divinely founded by our Redeemer, to be completely subject to the Supreme Pontiff, Vicar of Jesus Christ on earth, and be strictly united with him in regard to religious faith and morals. With these words - and it is well to note them - is embraced the whole life and work of the Church, and also its constitution, its government, its discipline. All of these things depend certainly on the will of Jesus Christ, Founder of the Church.
Source: Ad Sinarum Gentem (Vatican.va)