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It is not the strongest of the species that survive, nor the most intelligent, but the one most responsive to change.

The very essence of instinct is that it's followed independently of reason.

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

It has been a bitter mortification for me to digest the conclusion that the 'race is for the strong' and that I shall probably do little more but be content to admire the strides others made in science.

...it is always advisable to perceive clearly our ignorance.

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

The highest stage in moral culture at which we can arrive is when we recognize that we ought to control our thoughts.

I love fools experiments. I am always making them.

We must, however, acknowledge, as it seems to me, that man with all his noble qualities... still bears in his bodily frame the indelible stamp of his lowly origin.

Without speculation there is no good and original observation.

The presence of a body of well-instructed men, who have not to labor for their daily bread, is important to a degree which cannot be overestimated; as all high intellectual work is carried on by them, and on such work material progress of all kinds mainly depends, not to mention other and higher advantages.

I have steadily endeavored to keep my mind free so as to give up any hypothesis, however much beloved , as soon as the facts are shown to be opposed to it.

A man who dares to waste one hour of life has not discovered the value of life.