This sentence comes from the annotation of an episode of He Lu by Luo Dajing. Written by Luo Dajing in Song Dynasty. This book is divided into three parts: A, B and C, with volume *** 18. More than half of them are comments on the poems of the previous generation and the Song Dynasty, which record the anecdotes of the literati in the Song Dynasty and have the value of literary historical materials.
A person's state of mind can be slender as long as it is calm. Self-improvement will make his character firm and smart, and he will stick to his will. If he doesn't lose it, he will keep his blood in order and his spirit will be vigorous. If he keeps a low profile, he will hide his spirit and strength in his heart and wait for the opportunity. I don't know the last sentence.