No power and no treasure can outweigh the extension of our knowledge.
Nothing exists except atoms and empty space; everything else is opinion.
To a wise and good man the whole earth is his fatherland.
[I would] rather discover one cause than gain the kingdom of Persia.
Good means not merely not to do wrong, but rather not to desire to do wrong.
If thou sustain injustice, console thyself; the true unhappiness is in doing it
Everything existing in the universe is the fruit of chance and necessity.