Have the courage to take your own thoughts seriously, for they will shape you.
Conviction is a good motive, but a bad judge.
Smoke like a chimney, work like a horse, eat without thinking, go for a walk only in really pleasant company.
If I could do it all again, I'd be a plumber.
Compound interest on debt was the banker's greatest invention, to capture, and enslave, a productive society.
Discussion and argument are essential parts of science; the greatest talent is the ability to strip a theory until the simple basic idea emerges with clarity.