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Our design, not respecting arts, but philosophy, and our subject, not manual, but natural powers, we consider chiefly those things which relate to gravity, levity, elastic force, the resistance of fluids, and the like forces, whether attractive or impulsive; and therefore we offer this work as mathematical principles of philosophy; for all the difficulty of philosophy seems to consist in this — from the phenomena of motions to investigate the forces of nature, and then from these forces to demonstrate the other phenomena...
Every man carries about him a touchstone, if he will make use of it, to distinguish substantial gold from superficial glitterings, truth from appearances. And indeed the use and benefit of this touchstone, which is natural reason, is spoiled and lost only by assuming prejudices, overweening presumption, and narrowing our minds.
Dance and game are frivolous, unimportant down here; for "down here" is not their natural place. Here, they are a moment's rest from the life we were placed here to live. But in this world everything is upside down. That which, if it could be prolonged here, would be a truancy, is likest that which in a better country is the End of ends. Joy is the serious business of Heaven.
Menippus is a bird decked in various feathers which are not his. He neither says nor feels anything, but repeats the feelings and sayings of others; it is so natural for him to make use of other people's minds that he is the first deceived by it, and often believes he speaks his own mind or expresses his own thoughts when he is but the echo of some man he just parted with.
Epicurus, the great teacher of happiness, has correctly and finely divided human needs into three classes. First there are the natural and necessary needs which, if they are not satisfied, cause pain. Consequently, they are only victus et amictus [food and clothing] and are easy to satisfy. Then we have those that are natural yet not necessary, that is, the needs for sexual satisfaction. … These needs are more difficult to satisfy. Finally, there are those that are neither natural nor necessary, the needs for luxury, extravagance, pomp, and splendour, which are without end and very difficult to satisfy.
In a world that has been thoroughly permeated by the structures of the social order, a world that so overpowers every individual that scarcely any option remains but to accept it on its own terms, such naiveté reproduces itself incessantly and disastrously. What people have forced upon them by a boundless apparatus, which they themselves constitute and which they are locked into, virtually eliminates all natural elements and becomes nature to them.
The alternate domination of one faction over another, sharpened by the spirit of revenge, natural to party dissension, which in different ages and countries has perpetrated the most horrid enormities, is itself a frightful despotism. But this leads at length to a more formal and permanent despotism. The disorders and miseries, which result, gradually incline the minds of men to seek security and repose in the absolute power of an individual; and sooner or later the chief of some prevailing faction, more able or more fortunate than his competitors, turns this disposition to the purposes of his own elevation, on the ruins of Public Liberty.
Without my attempts in natural science, I should never have learned to know mankind such as it is. In nothing else can we so closely approach pure contemplation and thought, so closely observe the errors of the senses and of the understanding, the weak and strong points of character.
By nature's law, every man has a right to seize and retake by force his own property taken from him by another, by force of fraud. Nor is this natural right among the first which is taken into the hands of regular government after it is instituted. It was long retained by our ancestors. It was a part of their common law, laid down in their books, recognized by all the authorities, and regulated as to circumstances of practice.
Much more naturally than you do: because flight is a much more natural consequence of fear than of hate. He doesn't flee men because he hates them, but because he is afraid of them. He doesn't flee them in order to harm them, but to try o escape the harm they wish to do to him. They, on the contrary, don't seek him through friendship, but through hate. They seek him and he flees from them just as in the wilderness of Africa, where there are few men and many tigers, the men flee the tigers the men flee the tigers and the tigers seek the men.
Of all the intellectual faculties, judgment is the last to mature. A child under the age of fifteen should confine its attention either to subjects like mathematics, in which errors of judgment are impossible, or to subjects in which they are not very dangerous, like languages, natural science, history, etc.