过去永远存在，现在永远是过去。

The essence of mathematics lies in its freedom.

The more you do, the more you learn. The more you learn, the more you can do.

Attention is the spotlight of consciousness.

写作是将自己的一部分留在纸上，让别人能够找到它。

每天进步1%，一年后你会强大37倍。

自由在于做自己所愿。