I would warn you that I do not attribute to nature either beauty or deformity, order or confusion. Only in relation to our imagination can things be called beautiful or ugly, well-ordered or confused.

Freedom is absolutely necessary for the progress in science and the liberal arts.

Do not weep; do not wax indignant. Understand.

There is no hope unmingled with fear, and no fear unmingled with hope.

All happiness or unhappiness solely depends upon the quality of the object to which we are attached by love.

Happiness is a virtue, not its reward.

I do not know how to teach philosophy without becoming a disturber of established religion.

To give aid to every poor man is far beyond the reach and power of every man. Care of the poor is incumbent on society as a whole.

Peace is not the absence of war, but a virtue based on strength of character.

Fear cannot be without hope nor hope without fear.

Nothing in the universe is contingent, but all things are conditioned to exist and operate in a particular manner by the necessity of the divine nature.

Peace is not an absence of war, it is a virtue, a state of mind, a disposition for benevolence, confidence, justice.

For peace is not mere absence of war, but is a virtue that springs from, a state of mind, a disposition for benevolence, confidence, justice.

Ambition is the immoderate desire for power.

The highest activity a human being can attain is learning for understanding, because to understand is to be free.

It may easily come to pass that a vain man may become proud and imagine himself pleasing to all when he is in reality a universal nuisance.