Conversation so far:
What was the basis of Miyamoto Musashi's philosophy?
Miyamoto Musashi's The Book of Five Rings takes a philosophical approach to war: There are five ways in which men pass through life, gentlemen, warriors, farmers, artisans and merchants.“
What was considered being a gentleman according to Miyamoto Musashi?

Question: Did anyone help shape his philosophy?
Self-contained rewrite: Did anyone help shape Miyamoto Musashi's philosophy?