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凡事天下要考察有无的原则,必定是以众人的耳目所见所闻的实情以知有与无来作为标准的。 
A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.
观看与领悟是截然不同的两回事。除非悟出一样东西的美,否则不算领会。唯有如此,这样东西才真正存在。
Sustainability isn't a choice; it's our responsibility to the next generation.
How sharper than a serpent's tooth is to have a thankless child.