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.
作家是一个被困在一个人体内的世界。
释义:失败了不要总陷入后悔中,不能错失机会。  
林业不是开采,而是按照自然时间尺度进行的培育。
如果你愿意,可以错误地思考,但在任何情况下都要为自己思考。
写作是一种思考方式,而不仅仅是思想的记录。
The essence of mathematics is not to make simple things complicated, but to make complicated things simple.