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.

"All true stories are about the meeting of opposites."

The test of a first-rate intelligence is the ability to hold two opposed ideas in the mind at the same time, and still retain the ability to function.

教师最重要的是一颗理解的心，它值得无限地尊崇。人们在回忆中赞赏才华横溢的教师，但感激曾触动自己的人类情感的教师。对于成长中的孩子、对于孩子的灵魂，功课是必须的，但至关重要的营养是人性的温暖。