The meaning in the post is: we should solve the problem of rules and regulations from beginning to end, and carefully consider the consistency of lines and the concession of words. The particularly wonderful part can be taken out separately and studied repeatedly, and become my own and used by me.
Reason: The author of the original post was still adapting to the performance of the paper when he started writing. Usually the middle part is easier to write, and the most wonderful part is usually at the end, so that Tonglin can better understand the author's writing style of the original post and improve his calligraphy level.