“Nothing is worse than active ignorance.”

“There is nothing worse than aggressive stupidity.”

“There is nothing more frightful than ignorance in action.”

“When I consider the narrow limits within which our active and inquiring faculties are confined; when I see how all our energies are wasted in providing for mere necessities, which again have no further end than to prolong a wretched existence; and then that all our satisfaction concerning certain subjects of investigation ends in nothing better than a passive resignation... when I consider all this... I am silent.”

“Nothing is worth more than this day.”

“Nothing is more dangerous than solitude.”

“There is nothing in which people more betray their character than in what they laugh at.”