It should be noted, however, that there are no explicit doctrinal grounds for the representation of kuhon ojo (nine grades of birth in the Pure Land) by nine types of inso and they seem to have been contrived in early-modern times in Japan.
なお、九品往生を9通りの印相で表わす教義的根拠は明確でなく、日本において近世になってから考え出されたもののようである。