The past is never dead. It's not even past.
Mathematics is not a spectator sport; you have to play to understand.
"The world is full of magic things, patiently waiting for our senses to grow sharper."
世界上的一切存在都是为了最终进入一本书。
勿羡慕那些生活在愚昧“天堂”的人们,因为只有愚人才认为那里是幸福的。