Saint Augustine 
Of the Morals of the Catholic Church 

It is laid down at the outset that the customs of the holy life of the Church should be referred to the chief good of man, that is, God. We must seek after God with supreme affection; and this doctrine is supported in the Catholic Church by the authority of both Testaments. The four virtues get their names from different forms of this love. Then follow the duties of love to our neighbor. In the Catholic Church we find examples of continence and of true Christian conduct.