Six in the third place means:
A one-eyed man can indeed see, but not enough for clear vision. A lame man can indeed treat, but not enough to make progress. If in spite of such defects a man considers himself strong and consequently exposes himself to danger, he is inviting disaster, for he is undertaking something beyond his strength. This reckless way of plunging ahead, regardless of the adequacy of one's powers, can be justified only in the case of a warrior battling for his prince.