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数学的进步是通过它能解决的问题数量来衡量的。
The poverty of our century is unlike that of any other. It is not, as poverty was before, the result of natural scarcity, but of a set of priorities imposed upon the rest of the world by the rich.
The human heart is like the sea: it has its storms, its tides, and its depths; in it, too, there are pearls.
The strength of a nation's institutions is not just in their formal rules, but in the informal norms that govern behavior and the degree to which they are internalized by the population.
The best reward is seeing my fans smile.