None of our beliefs are quite true; all have at least a penumbra of vagueness and error.

If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do.

Education ought to foster the wish for truth, not the conviction that some particular creed is the truth.

Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.

It is a natural propensity to attribute misfortune to someone's malignity.

Every living thing is a sort of imperialist, seeking to transform as much as possible of its environment into itself.

Although it is a gloomy view to suppose that life will die out, sometimes when I contemplate the things that people do with their lives I think it is almost a consolation