Strategy is one discipline, applicable equally to combat and to any serious craft

Musashi opens by insisting the principles of strategy he's about to lay out aren't specific to swordsmanship but apply equally to any path requiring skill under pressure — he draws parallels between the way of the warrior and the disciplines of carpenters, merchants, and other tradesmen who must master tools and timing to succeed. A carpenter who truly understands his craft can apply the same underlying principles of preparation, tool selection, and situational judgment that a strategist applies to battle.

This framing elevates the text beyond a narrow martial manual: Musashi treats "the way of strategy" as a general competence in perceiving a situation clearly and acting on it skillfully, of which swordsmanship is simply the version he happened to master. The specific weapon or craft is almost incidental to the underlying mental discipline being described.

This is why the book has found readers in business and competition far removed from swordsmanship — Musashi himself invited that generalization. Takeaway: the discipline of mastering one demanding craft transfers, in its essentials, to mastering any other.