子夏曰：“日知其所无，月毋忘其所能，可谓好学也已矣。”
子夏说：“每天都学到些新东西，每月都不忘所学会的东西，就算好学了。”
Man's survival, from the time of Adam and Eve until the invention of agriculture, must have been precarious because of his inability to ensure his food supply.
生活的意义不在于答案，而在于提问。
Sustainability is not an option—it's a responsibility we owe to the next generation.