Many that live deserve death. And some die that deserve life. Can you give it to them? Then be not too eager to deal out death in the name of justice, fearing for your own safety. Even the wise cannot see all ends.

To argue with a person who has renounced the use of reason is like administering medicine to the dead.

Girls should be brought up to be comrades and helpers, not to be dolls. They should take a real and not a visionary share in the welfare of the nation.

Only a scientific people can survive in a scientific future.

Man with all his noble qualities, with sympathy which feels for the most debased, with benevolence which extends not only to other men but to the humblest living creature, with his god-like intellect which has penetrated into the movements and constitution of the solar system- with all these exalted powers- Man still bears in his bodily frame the indelible stamp of his lowly origin.

In the struggle for survival, the fittest win out at the expense of their rivals because they succeed in adapting themselves best to their environment.

Look not mournfully into the past. It comes not back again. Wisely improve the present. It is thine. Go forth to meet the shadowy future, without fear.

Knowledge is an unending adventure at the edge of uncertainty.

The theory of evolution is outstandingly the most important theory in biology.

Imagine a world without Darwin. Imagine a world in which Charles Darwin and Alfred Russel Wallace had not transformed our understanding of living things. What... would become baffling and puzzling..., in urgent need of explanation? The answer is: practically everything about living things....