If the misery of the poor is caused not by the laws of nature, but by our institutions, great is our sin.

We are optimists until we are not.

we are always slow in admitting any great change of which we do not see the intermediate steps.

The moral faculties are generally and justly esteemed as of higher value than the intellectual powers.

Even people who aren’t geniuses can outthink the rest of mankind if they develop certain thinking habits.

I have tried lately to read Shakespeare and found it so intolerably dull that it nauseated me.

Free will is to mind what chance is to matter.

Blushing is the most peculiar and most human of all expressions.

Such simple instincts as bees making a beehive could be sufficient to overthrow my whole theory.

Man is descended from a hairy, tailed quadruped, probably arboreal in its habits.

I am dying by inches, from not having anybody to talk to about insects.

A man's friendships are one of the best measures of his worth.

An agnostic would be the more correct description of my state of mind.

Much love many trials, but what an utter desert is a life without love.

It's not the strongest, but the most adaptable that survive.

The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.

How paramount the future is to the present when one is surrounded by children.

Intelligence is based on how efficient a species became at doing the things they need to survive.

Only the fittest will survive.