Yaki tachi wo saya ni osamete, masumasu masurao no kokoro wo togari keri "Before you draw your tempered blade, keep it in its saya and polish your soul first."

What a great Japanese proverb.  It doesn't say anything about kicking butt, winning medals or smashing people.  This seemingly succinct statement sums up what training in the martial arts is really all about - developing one's self.
Picture source: https://about.me/flaviogallozzi