See to it that you temper yourself with one thousand days of practice, and refine yourself with ten thousand days of training.
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