A discussion between Haldane and a friend began to take a predictable turn. The friend said with a sigh, 'It's no use going on. I know what you will say next, and I know what you will do next.' The distinguished scientist promptly sat down on the floor, turned two back somersaults, and returned to his seat. 'There,' he said with a smile. 'That's to prove that you're not always right.'
John B. S. HaldaneWould I lay down my life to save my brother? No, but I would to save two brothers or eight cousins.
John B. S. HaldaneTeleology is like a mistress to a biologist: he cannot live without her but he's unwilling to be seen with her in public.
John B. S. Haldane