"His hands would plait the priest's guts, if he had no rope, to strangle kings."

"Gratitude is a burden, and every burden is made to be shaken off."

"It is said that desire is a product of the will, but the converse is in fact true: will is a product of desire."

"If you want me to believe in God, you must make me touch him."

"Evil always turns up in this world through some genius or other."

"There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination."

"It is not human nature we should accuse but the despicable conventions that pervert it."

"Watch out for the fellow who talks about putting things in order! Putting things in order always means getting other people under your control."

"It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all."

"Every man has his dignity. I'm willing to forget mine, but at my own discretion and not when someone else tells me to."

"Poetry must have something in it that is barbaric, vast and wild."

"Pithy sentences are like sharp nails which force truth upon our memory."

"There is no good father who would want to resemble our Heavenly Father."

"There is no kind of harassment that a man may not inflict on a woman with impunity in civilized societies."

"The blood of Jesus Christ can cover a multitude of sins, it seems to me."

"The infant runs toward it with its eyes closed, the adult is stationary, the old man approaches it with his back turned."

"Skepticism is the first step on the road to philosophy."

"The possibility of divorce renders both marriage partners stricter in their observance of the duties they owe to each other. Divorces help to improve morals and to increase the population."

"To attempt the destruction of our passions is the height of folly. What a noble aim is that of the zealot who tortures himself like a madman in order to desire nothing, love nothing, feel nothing, and who, if he succeeded, would end up a complete monster!"

"When superstition is allowed to perform the task of old age in dulling the human temperament, we can say goodbye to all excellence in poetry, in painting, and in music."

"Bad company is as instructive as licentiousness. One makes up for the loss of one's innocence with the loss of one's prejudices."

"When science, art, literature, and philosophy are simply the manifestation of personality they are on a level where glorious and dazzling achievements are possible, which can make a man's name live for thousands of years."

"There is only one passion, the passion for happiness."

"Morals are in all countries the result of legislation and government; they are not African or Asian or European: they are good or bad."

"From fanaticism to barbarism is only one step."

"Gaiety is a quality of ordinary men. Genius always presupposes some disorder in the machine."

"We are far more liable to catch the vices than the virtues of our associates."

"My ideas are my whores."

"Good music is very close to primitive language."

"Man will never be free until the last king is strangled with the entrails of the last priest."

"If there is one realm in which it is essential to be sublime, it is in wickedness. You spit on a petty thief, but you can't deny a kind of respect for the great criminal."

"We are all instruments endowed with feeling and memory. Our senses are so many strings that are struck by surrounding objects and that also frequently strike themselves."

"Only passions, great passions can elevate the soul to great things."

"Although a man may wear fine clothing, if he lives peacefully; and is good, self-possessed, has faith and is pure; and if he does not hurt any living being, he is a holy man."

"All abstract sciences are nothing but the study of relations between signs."

"The best mannered people make the most absurd lovers."

"Power acquired by violence is only a usurpation, and lasts only as long as the force of him who commands prevails over that of those who obey."

"The decisions of law courts should never be printed: in the long run, they form a counter authority to the law."

"There are things I can't force. I must adjust. There are times when the greatest change needed is a change of my viewpoint."

"The God of the Christians is a father who makes much of his apples, and very little of his children."

"Only a very bad theologian would confuse the certainty that follows revelation with the truths that are revealed. They are entirely different things."

"Disturbances in society are never more fearful than when those who are stirring up the trouble can use the pretext of religion to mask their true designs."

"The general interest of the masses might take the place of the insight of genius if it were allowed freedom of action."

"Genius is present in every age, but the men carrying it within them remain benumbed unless extraordinary events occur to heat up and melt the mass so that it flows forth."

"No man has received from nature the right to command his fellow human beings."

"In order to shake a hypothesis, it is sometimes not necessary to do anything more than push it as far as it will go."

"The first step towards philosophy is incredulity."

"Our observation of nature must be diligent, our reflection profound, and our experiments exact. We rarely see these three means combined; and for this reason, creative geniuses are not common."

"Justice is the first virtue of those who command, and stops the complaints of those who obey."

"We swallow greedily any lie that flatters us, but we sip only little by little at a truth we find bitter."