English mathematician and philosopher
1861 - 1947
If a dog jumps in your lap, it is because he is fond of you but if a cat does the same thing, it is because your lap is warmer.
It does not matter what men say in words, so long as their activities are controlled by settled instincts. The words may ultimately destroy the instincts. But until this has occurred, words do not count. - from Science and the Modern World
Seek simplicity, and distrust it.
We cannot think first and act afterward. From the moment of birth we are immersed in action, and can only fitfully guide it by taking thought.
Ideas won't keep something must be done about them.