If you don’t believe in yourself, no one else will.
如果你不相信自己，别人也不会相信你。
The only limits that exist are the ones in your mind.
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 to be obeyed.