觀無量壽佛經疏 1.43

1.43

Answer: 'In the treatise, calling upon the Buddha is done solely with the desire to achieve the Buddha-fruit for oneself. In the sūtra, calling upon the Buddha is meant to distinguish them from the ninety-five kinds of non-Buddhists. Among non-Buddhists, there is no one who calls upon the Buddha. But if one even utters the Buddha's name once with one's mouth, one is already subsumed within the Buddha path; therefore it says "already completed."'