philosophy
“Be a philosopher; but, amidst all your philosophy, be still a man.”
“Reason is, and ought only to be the slave of the passions.”
“Leisure is the mother of philosophy.”
“The color of truth is gray.”
“Man is the only animal for whom his own existence is a problem which he has to solve and from which he cannot escape.”
“Love is the only sane and satisfactory answer to the problem of human existence.”
“Death destroys a man: the idea of death saves him.”
“Knowledge is not made for understanding; it is made for cutting.”
“Clocks slay time... time is dead as long as it is being clicked off by little wheels; only when the clock stops does time come to life.”
“Stupidity consists in wanting to reach conclusions.”
“Reality is merely an illusion, albeit a very persistent one.”
“Skepticism is the first step toward truth.”
“The Empire never ended.”
“Reality is that which, when you stop believing in it, doesn't go away.”
“Beauty will save the world.”
“To live without philosophizing is in truth the same as keeping the eyes closed without attempting to open them.”
“Good sense is of all things among men the most equally distributed.”
“If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.”
“Cogito, ergo sum.”
“Common sense in an uncommon degree is what the world calls wisdom.”