"If you shut up truth, and bury it underground, it will but grow." — Emile Zola

Keep well; that is the half of wisdom and of happiness.

I believe that the future of humanity is in the progress of reason through science. I believe that the pursuit of truth, through science, is the divine ideal which man should propose to himself.

In my view you cannot claim to have seen something until you have photographed it.

The fate of animals is of greater importance to me than the fear of appearing ridiculous; it is indissolubly connected with the fate of men.