The secret of change is to focus all of your energy not on fighting the old, but on building the new.

I am not a fast thinker at all. I have to spend a lot of time before I can understand something.

Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

凡事不能只看表面现象。钓鱼人虽然躬着身子，并不是因为对鱼恭敬；捕捉老鼠的人，把虫子留给老鼠吃，并不是因为喜爱老鼠。