If you want to learn the craft of war, ponder over this book. The teacher is as a needle, the disciple is as thread. You must practice constantly.
Miyamoto MusashiNo man is invincible, and therefore no man can fully understand that which would make him invincible. Even with complete and thorough study there is always the possibility of being defeated and although one may be expert in a particular form, mastery is something a man never stops seeking to attain.
Miyamoto Musashi