Shien's nindō was created soon after he became a shinobi. He swore to never give up, and always try your hardest, because even the weaker can become strong, and used this to soon pass over his rival, and proved that hard work > natural talent. When he joined the D.A.H, his Nindō temporarily changed, and he felt that his nindō was to let all traitors die, pay, and that they didn't deserve to live in the world. His Nindō changed once more after coming back to the village, however.