What does Duke Zhou mean by sewing a hat for his nephew?

Some lonely days. But this is often self-inflicted. You are quite addicted to this feeling of loneliness today. Although it brings you a bad mood, you are enjoying it just like self-abuse. Memories are the companions who accompany you more today, and you often unconsciously beautify the people and things in the past. I suggest you write some articles, which will be more in line with this mood. With the virtues of father and ancestors, or the care and training of elders, it is easy to develop upward and the situation is peaceful. Although there is no amazing achievement, it can be extended smoothly and gradually to celebrate the signs of happiness and longevity. Hope to adopt