We owe most of our great inventions and most of the achievements of genius to idleness either enforced or voluntary.

One of us in this very room is in fact the murderer.

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.

You gave too much rein to your imagination. Imagination is a good servant, and a bad master. The simplest explanation is always the most likely.

There is no detective in England equal to a spinster lady of uncertain age with plenty of time on her hands.

The heart of a woman who loves will forgive many blows.

If one sticks too rigidly to one's principles, one would hardly see anybody.