The highest art is to conceal art.

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.

心理学必须独立于哲学和生理学。

读书人虽然有书本知识，但最根本的还是在于把书本知识变为实际行动。