If a man is often the subject of conversation he soon becomes the subject of criticism.

Human reason has this peculiar fate that in one species of its knowledge it is burdened by questions which, as prescribed by the very nature of reason itself, it is not able to ignore, but which, as transcending all its powers, it is also not able to answer.

Man relates to material things through direct insight rather than reason.

If justice perishes, human life on Earth has lost its meaning.

Suicide is not abominable because God prohibits it; God prohibits it because it is abominable.

The only objects of practical reason are therefore those of good and evil. For by the former is meant an object necessarily desired according to a principle of reason; by the latter one necessarily shunned, also according to a principle of reason.

There is no virtue in penance and fasting which waste the body; they are only fanatical and monkish.