Civil wars are the greatest of evils. They are inevitable, if we wish to reward merit, for all will say that they are meritorious.

To scorn philosophy is truly to philosophize.

To deny, to believe, and to doubt well, are to a man what the race is to a horse.

All sorrow has its root in man's inability to sit quiet in a room by himself.

By a peculiar prerogative, not only each individual is making daily advances in the sciences, and may make advances in morality (which is the science, by way of eminence, of living well and being happy), but all mankind together is making a continual progress in proportion as the universe grows older. So that the whole human race, during the course of so many ages, may be considered as one man who never ceases to live and learn.

The art of revolutionizing and overturning states is to undermine established customs, by going back to their origin, in order to mark their want of justice.

If you want to be a real seeker of truth, you need to, at least once in your lifetime, doubt in, as much as it's possible, in everything.