What are books or memoirs from great people that can help future great people?

There is Meditations by Aurelius, yes. But it is more generic and often related to administration.

What are some books, letters, autobiographies, or memoirs of great people, polymaths of the past that future, aspiring polymaths can learn from?

It will be better if the book focuses more on the becoming, growth part rather than polished words of a made, established person.