"The mistakes of the present are corrected by keeping the mistakes of the past" and "selecting what is feasible can be used as a guide, and what is not possible can be used as a lesson." It is advisable to use the past for the present and to facilitate the creation of contemporary people. The book contains miscellaneous comments on the merits and demerits of previous poems, and occasionally identifies the sources of errors in words and sentences and explains their general meaning.
