我不认为有极限。

如果你不能把它变得简单明了，那说明你还没有理解它。

书籍是想象力的种子。

真正的发现之旅不在于寻找新的风景，而在于拥有新的眼光。

Man will not merely endure: he will prevail.

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.