Indulge yourself in pleasures only in so far as they are necessary for the preservation of health.
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.
He who regulates everything by laws, is more likely to arouse vices than reform them.
Freedom is self-determination.
Happiness is a virtue, not its reward.
Whatsoever is contrary to nature is contrary to reason, and whatsoever is contrary to reason is absurd.
Philosophy has no end in view save truth; faith looks for nothing but obedience and piety.
He, who knows how to distinguish between true and false, must have an adequate idea of true and false.
Desire is the essence of a man.
True virtue is life under the direction of reason.
Let unswerving integrity be your watchword.
Those who are believed to be most abject and humble are usually most ambitious and envious.
Laws which prescribe what everyone must believe, and forbid men to say or write anything against this or that opinion, are often passed to gratify, or rather to appease the anger of those who cannot abide independent minds.
I have made a ceaseless effort not to ridicule, not to bewail, not to scorn human actions, but to understand them.
The greatest good is the knowledge of the union which the mind has with the whole nature.
Nature is satisfied with little; and if she is, I am also.
[Believers] are but triflers who, when they cannot explain a thing, run back to the will of God; this is, truly, a ridiculous way of expressing ignorance.
Do not weep; do not wax indignant. Understand.
What everyone wants from life is continuous and genuine happiness.
We must take care not to admit as true anything, which is only probable. For when one falsity has been let in, infinite others follow.
Superstition, then, is engendered, preserved, and fostered by fear.
Nature has no goal in view, and final causes are only human imaginings.
Men who are ruled by reason desire nothing for themselves which they would not wish for all mankind.
Hatred is increased by being reciprocated, and can on the other hand be destroyed by love.
I saw that all things I feared, and which feared me, had nothing good or bad in them save insofar as the mind was affected by them.
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