"There are many things that most properly keep me in the bosom of the Catholic Church; to say nothing of the most genuine wisdom."
"The consensus of peoples and races keeps me in the Church, as does the authority based on miracles, nourished by hope, increased by charity, strengthened by its ancient character; likewise the succession of the priests, from the very see of the apostle Peter, to whom the Lord entrusted the care of His sheep after the resurrection, down to the episcopate of today; finally, the very name of the Catholic Church keeps me in her, because it is not without reason that this Church alone has obtained such a name amid so many heresies."
-- St. Augustine, Contra ep. Man. 4,5:PL 42,175.