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.