The true virtue of human beings is fitness to live together as equals; claiming nothing for themselves but what they as freely concede to everyone else; regarding command of any kind as an exceptional neccessity, and in all cases a temporary one.

It appears, then, to be a condition of a genuinely scientific hypothesis, that it be not destined always to remain an hypothesis, but be certain to be either proved or disproved by.. .comparison with observed facts.

Life has a certain flavor for those who have fought and risked all that the sheltered and protected can never experience.

Almost all rich veins of original and striking speculation have been opened by systematic half-thinkers.

I have learned to seek my happiness by limiting my desires, rather than in attempting to satisfy them.

When one's ideas are not challenged, one's ability to defend them weakens.

I am not aware that any community has a right to force another to be civilized.