Art is right reason in the doing of work.
Reason in man is rather like God in the world.
Nothing created has ever been able to fill the heart of man. God alone can fill it infinitely.
Charity is the form, mover, mother and root of all the virtues.
Obedience unites us so closely to God that it in a way transforms us into Him, so that we have no other will but His. If obedience is lacking, even prayer cannot be pleasing to God.
Happiness is secured through virtue; it is a good attained by man's own will.