The possibilities of existence run so deeply into the extravagant that there is scarcely any conception too extraordinary for Nature to realise.

I cannot afford to waste my time making money

Lay aside all conceit Learn to read the book of Nature for yourself. Those who have succeeded best have followed for years some slim thread which once in a while has broadened out and disclosed some treasure worth a life-long search.

The facts will eventually test all our theories, and they form, after all, the only impartial jury to which we can appeal.

Facts are stupid until brought into connection with some general law.

A laboratory of natural history is a sanctuary where nothing profane should be tolerated. I feel less agony at improprieties in churches than in a scientific laboratory.

The resources of the Deity cannot be so meagre, that, in order to create a human being endowed with reason, he must change a monkey into a man.