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 best way to predict the future is to create it.

应该引导孩子通过自己的活动去发现真理。

The coal research is just as important as the DNA work.

内省是唯一可以直接观察心灵的方法。