It is a theory that since they have both become 'Namu amidabutsu,' the 'vow to attain enlightenment' and 'practices of Bodhisattva,' which Bodhisattva must pursue, are contained in the myogo.
この双方が「南無阿弥陀仏」と仕上がっているので、菩薩が行わなくてはならない「発願」と「菩薩行」の2つが、名号に完備しているという説。