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

How would it be possible if salvation were ready to our hand, and could without great labor be found, that it should be by almost all men neglected? But all things excellent are as difficult as they are rare.

Pride is pleasure arising from a man's thinking too highly of himself.

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

Nothing exists from whose nature some effect does not follow.

Happiness is a virtue, not its reward.

God is the indwelling and not the transient cause of all things.

The world would be happier if men had the same capacity to be silent that they have to speak.

Do not weep; do not wax indignant. Understand.

He alone is free who lives with free consent under the entire guidance of reason.

Desire is the essence of a man.

Self-complacency is pleasure accompanied by the idea of oneself as cause.

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

Whatsoever is contrary to nature is contrary to reason, and whatsoever is contrary to reason is absurd.

I have striven not to laugh at human actions, not to weep at them, nor to hate them, but to understand them.

The greatest pride, or the greatest despondency, is the greatest ignorance of one's self.

Fame has also this great drawback, that if we pursue it, we must direct our lives so as to please the fancy of men.

Only that thing is free which exists by the necessities of its own nature, and is determined in its actions by itself alone.

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.

Fear cannot be without hope nor hope without fear.

Blessedness is not the reward of virtue but virtue itself.

Men govern nothing with more difficulty than their tongues, and can moderate their desires more than their words.

I call him free who is led solely by reason.

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

If men were born free, they would, so long as they remained free, form no conception of good and evil.

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

If you want the present to be different from the past, study the past.

All things excellent are as difficult as they are rare.

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.

Desire is the very essence of man.

Be not astonished at new ideas; for it is well known to you that a thing does not therefore cease to be true because it is not accepted by many.

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.

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

So long as a man imagines that he cannot do this or that, so long as he is determined not to do it; and consequently so long as it is impossible to him that he should do it.

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

The endeavor to understand is the first and only basis of virtue.

None are more taken in by flattery than the proud, who wish to be the first and are not.

True virtue is life under the direction of reason.

Those who are believed to be most abject and humble are usually most ambitious and envious.

All noble things are as difficult as they are rare.

We feel and know that we are eternal.

Whatsoever is, is in God, and without God nothing can be, or be conceived.

One and the same thing can at the same time be good, bad, and indifferent, e.g., music is good to the melancholy, bad to those who mourn, and neither good nor bad to the deaf.

Sin cannot be conceived in a natural state, but only in a civil state, where it is decreed by common consent what is good or bad.

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.

Ambition is the immoderate desire for power.

I have made a ceaseless effort not to ridicule, not to bewail, not to scorn human actions, but to understand them.

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

Will and intellect are one and the same thing.