"Books are the mirrors that reflect our desires."
                    世俗的人以自身性命为性命,而君子以万物的性命为自身性命。
                    学习问题的复杂性通常由假设空间的大小和结构决定。
                    The thing about happiness is that you only know you had it when it's gone.
                    The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.