The human mind prefers to be spoon-fed with the thoughts of others, but deprived of such nourishment it will, reluctantly, begin to think for itself - and such thinking, remember, is original thinking and may have valuable results.
I've got a stomach now as well as a behind. And I mean - well, you can't pull it in both ways, can you? ... I've made it a rule to pull in my stomach and let my behind look after itself.
Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]
I don't go in for being sorry for people. For one thing it's insulting. One is only sorry for people when they're sorry for themselves. Self-pity is one of the biggest stumbling blocks in the world today.