近代学者王国维指出:“诗人对于宇宙人生要既入乎内,又出乎外。入乎其内,故有生气;出乎其外,故有高致。”既要细腻入微,又要剀切事理。仅入乎其内,就显得肤浅,狭隘。就事论事,就如同粱仍为粱,大不过炊粱为食;花仍为花,大不过花凋坐果。而出乎其外,就犹如将粱酿而为酒;将花酿而 Wang Guowei, a modern scholar, pointed out: "Poets must be both inward and outward in the life of the universe. Cut things. Only within its own, it appears superficial, narrow. On the matter, just as the beam is still sorghum, large but for food; flower is still spent, but the fruit withered. And contrary to the outside, it is like a wine brewed into sorghum;