Three things are necessary for the salvation of man: to know what he ought to believe, to know what he ought to desire, and to know what he ought to do.
There is nothing on this earth more to be prized than true friendship.
Faith has to do with things that are not seen and hope with things that are not at hand.
Every judgement of conscience, be it right or wrong, be it about things evil in themselves or morally indifferent, is obligatory in such wise that he who acts against his conscience always sins.
Good can exist without evil, whereas evil cannot exist without good.