Nothing gives life more zest that running for your life.

Never try to outstubborn a cat.

Men are more sentimental than women. It blurs their thinking.

The extremely tiny fraction who think regularly, accurately, creatively, and without self-delusion - in the long run, these are the only people who count.

Anyone who cannot cope with mathematics is not fully human. At best, he is a tolerable subhuman who has learned to wear his shoes, bathe, and not make messes in the house.

The greatest productive force is human selfishness.

Always listen to experts. They'll tell you what can't be done, and why. Then do it.