If it weren’t for the bone-chilling cold, how could the plum blossoms be so fragrant?
The edge of a sword comes from sharpening, and the fragrance of plum blossoms comes from the bitter cold.
Although it is hard work to search for thousands of pounds, you will only get gold after blowing all the sand.
Play a thousand tunes and then the sound will dawn, watch a thousand swords and then recognize the weapon.
If you don’t climb a high mountain, you don’t know how high the sky is; if you don’t go to a deep stream, you don’t know how thick the earth is.