Perhaps as important is the relation between the existence of solutions to a competitive equilibrium and the problems of normative or welfare economics.

人们在遇到别人蛮横无理的时候，往往怒火中烧，可是忽然转眼一想自己也有过错，不知不觉怒气就消失得干干净净。由此看来孟子所强调的自我反省，实在是息事宁人、涵养正气、受益获福、求得身心快乐的最好办法，千万不要当作一般道学家的套话来看待。

Loneliness is not lack of company, loneliness is lack of purpose.

"The poet is a liar who always speaks the truth."

定理是数学的永久文献。