As soon as an opinion becomes common it is sufficient reason for men to abandon it and to uphold the opposite opinion until that in its turn grows old, and they require to distinguish themselves by other things. Thus if they attain their goal in some art or science, we must expect them soon to cast it aside to acquire some fresh fame, and this is partly the reason why the most splendid ages degenerate so quickly, and, scarcely emerged from barbarism, plunge into it again.
The falsest of all philosophies is that which, under the pretext of delivering men from the embarrassment of their passions, counsels idleness and the abandonment and neglect of themselves.
All that causes one man to differ from another is a very slight thing. What is it that is the origin of beauty or ugliness, health or weakness, ability or stupidity? A slight difference in the organs, a little more or a little less bile. Yet this more or less is of infinite importance to men; and when they think otherwise they are mistaken.
We ought never to be afraid to repeat an ancient truth, when we feel that we can make it more striking by a neater turn, or bring it alongside of another truth, which may make it clearer, and thereby accumulate evidence. It belongs to the inventive faculty to see clearly the relative state of things, and to be able to place them in connection; but the discoveries of ages gone by belong less to their first authors than to those who make them practically useful to the world.
With kings, nations, and private individuals, the strongest assume to themselves rights over the weakest, and the same rule is followed by animals, by matter, by the elements, so that everything is performed in the universe by violence. And that order which we blame with some appearance of justice is the most universal, most absolute, most unchangeable, and most ancient law of nature.