Zendo (Shan-dao) read '乃至十念若不生者不取正覚' in the Hongan (the eighteenth of the Forty-eight Vows) made by Amida as ' If, when I attain Buddhahood, the sentient beings of the ten quarters say my Name even ten times but do not attain birth, may I not attain the supreme enlightenment,' and interpreted it as the vow of Shomyo ojo (literally, people's birth in the Pure Land by the power of Shomyo).
善導は、阿弥陀仏の本願（四十八願第十八願）に「乃至十念若不生者不取正覚」とあるのを、「我が名字を称すること下十声に至るまでもし生れずは正覚を取らじ」と読み、称名往生を誓ったたものと解釈した。