The greatest obstacle to being heroic is the doubt whether one may not be going to prove one's self a fool; the truest heroism is to resist the doubt, and the profoundest wisdom to know when it ought to be resisted, and when it be obeyed.

海洋从四面八方包围着地球，而我们只居住在其中一小部分。

The best things in life are unexpected.

可持续性不仅是一种趋势，更是一种责任。