The only real failure in life is not to be true to the best one knows.

Always ask: How can we do better? Then act on the answer.

The best way to cheer yourself up is to try to cheer somebody else up.

The most important property of a program is whether it accomplishes the intention of its user.

If you ask an economist what’s driven economic growth, it’s been major advances in things that mattered – the mechanization of farming, mass manufacturing, things like that. The problem is, our society is not organized around doing that.

Modern quarrying must marry the wisdom of geology with the innovation of engineering.