人心充满私欲，所以危险；道心符合天理，所以精妙。

The jaws of power are always open to devour, and her arm is always stretched out, if possible, to destroy the freedom of thinking, speaking, and writing.

Mathematics is the poetry of logical ideas.

We don't inherit the ocean from our ancestors—we borrow it from our children.

【释义】：天地日月无私地庇护、承载、照耀万物，体现了自然的无私和广博。