The only service a friend can really render is to keep up your courage by holding up to you a mirror in which you can see a noble image of yourself.

He has not learned the first lesson of life who does not every day surmount a fear.

飞蓬生长在麻地里，不用扶持也能挺立；白沙混进黑色泥土，也会跟着一起变黑。

I can't go on, I'll go on.