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

• A man's friendships are one of the best measures of his worth.
• It is not the strongest of the species that survives, nor the most intelligent that survives. It is the one that is the most adaptable to change.
• A man's friendships are one of the best measures of his worth.
• How paramount the future is to the present when one is surrounded by children.
• At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world.
• I cannot persuade myself that a beneficent and omnipotent God would have designedly created parasitic wasps with the express intention of their feeding within the living bodies of Caterpillars.
• To kill an error is as good a service as, and sometimes even better than, the establishing of a new truth or fact.
• If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.
• In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed.
• 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.