Your most unhappy customers are your greatest source of learning.
One should eat to live,not live to eat.
出自《魏源集·默觚下·治篇五》。三代以上,天都跟现在的天不一样,地都跟现在的地不一样,人也跟现在的人不一样,物也和现在的物不一样。
The human capacity for care is not finite; the more we give, the more we have to give.