The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.
The very essence of instinct is that it's followed independently of reason.
I am turned into a sort of machine for observing facts and grinding out conclusions.
A moral being is one who is capable of reflecting on his past actions and their motives - of approving of some and disapproving of others.
If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.
An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.
Ignorance more frequently begets confidence than does knowledge: it is those who know little, and not those who know much, who so positively assert that this or that problem will never be solved by science.
A man's friendships are one of the best measures of his worth.
The mystery of the beginning of all things is insoluble by us; and I for one must be content to remain an agnostic.
A man who dares to waste one hour of time has not discovered the value of life.
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