The book says: those who know how to advance and retreat without losing their correctness are saints, who come from the Book of Changes and are willing to stick to divination! However, it is really difficult to know how to advance and retreat, but it is more important for a man to "keep good faith". Judging from Puyi's behavior, he lost his integrity. Therefore, he wrote this sentence as if he were excusing himself.
Puyi calligraphy, pay attention to the inscription: Xuan Tong Imperial Pen!
When Puyi was able to write such a word, he was no longer an emperor, but he still said "imperial pen". It can be seen that there is still an emperor's dream in his heart.