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

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

I have steadily endeavored to keep my mind free so as to give up any hypothesis, however much beloved (and I cannot resist forming one on every subject), as soon as the facts ar ...

I love fools experiments. I am always making them.

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 stride ...

it is always advisable to perceive clearly our ignorance.

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

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

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 ...