The doctrine of transmigration… was a means of constructing a plausible vindication of the ways of the cosmos to man; … none but very hasty thinkers will reject it on the grounds of inherent absurdity.

It is not who is right, but what is right, that is of importance.

Of moral purpose I see no trace in Nature. That is an article of exclusively human manufacture and very much to our credit.

Try to learn something about everything and everything about something.

Science is nothing, but trained and organized common sense.

The man of science has learned to believe in justification, not by faith, but by verification.

Surely there is a time to submit to guidance and a time to take one's own way at all hazards.