I will give up my belief in evolution if someone finds a fossil rabbit in the Precambrian.

Would I lay down my life to save my brother? No, but I would to save two brothers or eight cousins.

An attempt to study the evolution of living organisms without reference to cytology would be as futile as an account of stellar evolution which ignored spectroscopy.

The wise man regulates his conduct by the theories both of religion and science. But he regards these theories not as statements of ultimate fact but as art-forms.

Teleology is like a mistress to a biologist: he cannot live without her but he's unwilling to be seen with her in public.

Capitalism, though it may not always give the scientific worker a living wage, will always protect him, as being one of the geese which produce golden eggs for its table.

The extreme socialists desire to run every nation as a single business concern.