Competence—and just as importantly, the ability to increase it—could possibly be the most valuable commodity in all of existence. It allows us the luxuries of downtime and morals, and it is a formidable shield against personal pain.
I also believe that one who seeks competence across all domains can realize deeper teachings from age-old texts…without even so much as glancing at their pages.
Dirty Sci-Fi Buddha 
Competence is on the scale of mastery. Few master many things. Yet becoming a master in one thing shows what it takes to grow beyond competence. The ancient texts of masters have layers for the spectrum of achievement, just as guild and unions.
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I think mastery leads to competence in many things, and competence in many things facilitates mastery. They’re both ways to grasp a common core between varying domains of activity.
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I agree the two are linked, mostly in mindset and commitment. Apprentice, Journeyman, and Master are each defined by a certain set of competencies and demonstrable skill. Those components cannot help but bolster the way people look at, approach, and build mastery in other things. You sound like this is the approach you are choosing.
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I read Musashi’s Book of Five Rings in elementary school, lol, so definitely.
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