Even in the important matter of cranial capacity, Men differ more widely from one another than they do from the Apes; while the lowest Apes differ as much, in proportion, from the highest, as the latter does from Man.

History warns us that it is the customary fate of new truths to begin as heresies and to end as superstitions.

I am not afraid of the priests in the long-run. Scientific method is the white ant which will slowly but surely destroy their fortifications. And the importance of scientific method in modern practical life--always growing and increasing--is the guarantee for the gradual emancipation of the ignorant upper and lower classes, the former of whom especially are the strength of the priests.

In fact a favourite problem of Tyndall is-Given the molecular forces in a mutton chop, deduce Hamlet or Faust therefrom. He is confident that the Physics of the Future will solve this easily.

I would rather be the offspring of two apes than be a man and afraid to face the truth.

In matters of intellect, follow your reason as far as it will take you, without regard for any other consideration.

The ultimate court of appeal is observation and experiment... not authority.