The more you see yourself as a product, the less you see yourself as a person.
Nothing’s lost forever. In this world, there’s a kind of painful progress. Longing for what we’ve left behind, and dreaming ahead.
数学的快乐来自于为理解而奋斗。
一个人有身份有地位的时候朋友很多，但危难时候却没人与之交待。