“IN the first place, I want you to hold as the basic truth of this discussion that our Lord Jesus Christ, as He Himself said in the Gospel, has subjected us to His yoke and His burden, which are light. Therefore, He has laid on the society of His new people the obligations of the sacraments, most sublime in their meaning, as, for example, baptism hallowed by the name of the Trinity, Communion of His Body and His Blood, and whatever else is commended in the canonical writings, with the exception of those burdens found in the five books of Moses, which imposed on the ancient people a servitude in accordance with their character and prophetic times in which they have lived. But, regarding those other observances which we keep and all the world keeps, and which do not derive from Scripture but from tradition, we are given to understand that they have been ordained or recommended to be kept by the Apostles themselves, or by plenary councils, whose authority is well founded in the Church.”
~St. Augustine: Letters, 44; To Janarius.