What will be the good of the conquest of leisure and health, if no one remembers how to use them?

Beware the man of the single book

Against the vast majority of my countrymen, even at this moment, in the name of humanity and civilization, I protest against our share in the destruction of Germany. A month ago Europe was a peaceful comity of nations; if an Englishman killed a German, he was hanged. Now, if an Englishman kills a German, or if a German kills an Englishman, he is a patriot, who has deserved well of his country.

Bad philosophers may have a certain influence; good philosophers, never.

I think it would be just to say the most essential characteristic of mind is memory, using this word in its broadest sense to include every influence of past experience on present reactions.

Aristotle and Plato considered Greeks so innately superior to barbarians that slavery is justified so long as the master is Greek and the slave barbarian.

Dogma demands authority, rather than intelligent thought, as the source of opinion; it requires persecution of heretics and hostility to unbelievers; it asks of its disciples that they should inhibit natural kindliness in favor of systematic hatred.