The principal act of courage is to endure and withstand dangers doggedly rather than to attack them.

Practical sciences proceed by building up; theoretical science by resolving into components.

Sloth is sluggishness of the mind which neglects to begin good...it is evil in its effect, if it so oppresses man as to draw him away entirely from good deeds.

Man cannot live without joy; therefore when he is deprived of true spiritual joys it is necessary that he become addicted to carnal pleasures.

The last end of every maker, as such, is himself, for what we make we use for our own sake; and if at any time a man make a thing for the sake of something else, it is referred to his own good, whether his use, his pleasure, or his virtue.

Prostitution in the towns is like the cesspool in the palace; take away the cesspool and the palace will become an unclean and evil smelling-place.

Clearly the person who accepts the Church as an infallible guide will believe whatever the Church teaches.