The individual is not accountable to society for his actions in so far as these concern the interests of no person but himself.
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.
我们不只是制造家具,我们创造生活发生的环境。
I have already carried out my duty. I have proved the Poincaré conjecture and I have nothing more to do in mathematics.