The mountains cover the white sun, and the oceans deplete the golden rivers, but you can broaden your horizons by walking up a flight of stairs.

The Analects of Confucius in the pre-Qin period: The Book of Songs says,' If it is incisive, it will be like grinding.' Song Zhuxi's note: "Those who treat bone angles with words must cut them off and discuss them again;" If you deal with jade, you should cut it and then grind it. Be kind to it and seek its essence. "

Modest bamboo has curved leaves, and proud plums are not spent on its back.