A good scholar, regardless of poetry, calligraphy and painting, should learn from the ancients or the near sages. What does this mean?

A good scholar who steals ideas, regardless of poetry, painting and calligraphy, must first learn from the ancients or the sages. When you enter the room, you must set up your own portal and have your own faction. This is called a famous family.

The meaning of this passage is:

I think anyone who likes learning, whether learning poetry, prose, calligraphy, painting or seal cutting, must first learn from the ancients or contemporary masters. After reaching the master level, you must innovate yourself and have your own characteristics to be a master.