Courage is knowing it might hurt and doing it anyway. Stupidity is the same, so that's why life is hard.
However, there is one man who could afford to be stupid—自分.
自分's effectively immortal, his wounds healing so fast he makes it appear like bullets simply pass through him
Likewise, 自分's swordsmanship is suicidal, always risking vital organs in exchange for even a single cut, a drop of blood