Democracy is the worst form of government except all those other forms that have been tried from time to time.

I believe in the power of music to heal.

The world is full of obvious things which nobody by any chance ever observes.

The fundamental point in fabricating a chain reacting machine is of course to see to it that each fission produces a certain number of neutrons and some of these neutrons will again produce fission.

老年人相信每一件事物；中年人猜疑每一件事物；青年人什么都懂。

"A poet is someone who spends years patiently trying to discover the second being inside him."