A grain in the balance will determine which individual shall live and which shall die - which variety or species shall increase in number, and which shall decrease, or finally become extinct.

— Charles Darwin

A grand and almost untrod den field of inquiry will be opened, on the causes and laws of variation, on correlation of growth, on the effects of use and disuse, on the direct actions of external conditions, and so forth.

— Charles Darwin

[Alexander von Humboldt was the] greatest scientific traveler who ever lived.

— Charles Darwin

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

— Charles Darwin

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

— Charles Darwin

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

— Charles Darwin

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.

— Charles Darwin

An American monkey, after getting drunk on brandy, would never touch it again, and thus is much wiser than most men.

— Charles Darwin

As for a future life every man must judge for himself between conflicting vague possibilities.

— Charles Darwin

As for future life every man must judge for himself between conflicting vague probabilities.

— Charles Darwin