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The supreme mystery of despotism, its prop and stay, is to keep men in a state of deception, and with the specious title of religion to cloak the fear by which they must be held in check, so that they will fight for their servitude as if for salvation.
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True virtue is life under the direction of reason.
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Only that thing is free which exists by the necessities of its own nature, and is determined in its actions by itself alone.
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Maxima superbia vel abjectio est maxima sui ignorantia.
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Happiness is a virtue, not its reward.
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I have striven not to laugh at human actions, not to weep at them, nor to hate them, but to understand them.
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[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.
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Tota felicitas aut infelicitas in hoc solo sita est; videlicet in qualitate obiecti, cui adhaeremus amore.
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I do not know how to teach philosophy without becoming a disturber of established religion.
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Men govern nothing with more difficulty than their tongues, and can moderate their desires more than their words.
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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.
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As though God had turned away from the wise, and written his decrees, not in the mind of man but in the entrails of beasts, or left them to be proclaimed by the inspiration and instinct of fools, madmen, and birds. Such is the unreason to which terror can drive mankind!
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In the mind there is no absolute or free will; but the mind is determined to wish this or that by a cause, which has also been determined by another cause, and this last by another cause, and so on to infinity.
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Of all the things that are beyond my power, I value nothing more highly than to be allowed the honor of entering into bonds of friendship with people who sincerely love truth. For, of things beyond our power, I believe there is nothing in the world which we can love with tranquility except such men.
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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.
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The ordinary surroundings of life which are esteemed by men (as their actions testify) to be the highest good, may be classed under the three heads - Riches, Fame, and the Pleasures of Sense: with these three the mind is so absorbed that it has little power to reflect on any different good.
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Man can, indeed, act contrarily to the decrees of God, as far as they have been written like laws in the minds of ourselves or the prophets, but against that eternal decree of God, which is written in universal nature, and has regard to the course of nature as a whole, he can do nothing.
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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.
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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.
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All the objects pursued by the multitude not only bring no remedy that tends to preserve our being, but even act as hinderances, causing the death not seldom of those who possess them, and always of those who are possessed by them.
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The real disturbers of the peace are those who, in a free state, seek to curtail the liberty of judgment which they are unable to tyrannize over.
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He who seeks equality between unequals seeks an absurdity.
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Meum institutum non est verborum significationem sed rerum naturam explicare
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Further conceive, I beg, that a stone, while continuing in motion, should be capable of thinking and knowing, that it is endeavoring, as far as it can, to continue to move. Such a stone, being conscious merely of its own endeavor and not at all indifferent, would believe itself to be completely free, and would think that it continued in motion solely because of its own wish. This is that human freedom, which all boast that they possess, and which consists solely in the fact, that men are conscious of their own desire, but are ignorant of the causes whereby that desire has been determined.