Buying tools: Start by buying the absolute cheapest tools you can find. Upgrade the ones you use a lot. If you wind up using some tool for a job， buy the very best you can afford.

The success of liberal democracy depends on the ability of its institutions to adapt to changing circumstances.

唯一的旅程是内心的旅程。

The aim of every artist is to arrest motion, which is life, by artificial means and hold it fixed so that a hundred years later, when a stranger looks at it, it moves again since it is life.

The coal industry must evolve with technology to meet global energy demands sustainably.

Loneliness is the price we pay for being born.

The beauty of mathematics is that it is one of the few areas of human endeavor where absolute truth can be known.

The secret of getting ahead is getting started.