The famous epigram is synonymous with "there is a way to learn from mountains, but there is no limit to learning from the sea." In the final analysis, the blade comes from sharpening, and the plum blossom fragrance comes from bitter cold.

Solve the problem:

"Bao Jianfeng comes from sharpening, and plum blossoms come from bitter cold" means that Bao Jianfeng comes from sharpening, and the plum blossoms that have survived the cold winter are more fragrant.

Metaphor requires constant efforts, training and overcoming certain difficulties in order to have precious qualities or beautiful talents.