藥師經疏 1.64

1.64

經。佛言至無有是處　三如來順成文分為六。一正明順成。二甚為難諒。三信微加力。四非諦小機。五受質誠難。六劫窮盡讚。此則初也。謂聞藥師佛名。至心受持不生疑惑。墮惡趣者無有是處。

Sūtra: 'The Buddha said... there is no such possibility.' Part 3: The Tathāgata confirms in accord [with the truth]. The text has six sections: 1. Directly clarifying the confirmation; 2. Being extremely difficult to comprehend; 3. Faith being weak, [the Buddha] adds his power; 4. Not being within the capacity of the small vehicle; 5. Receiving human life is truly difficult; 6. Praising that an eon could be exhausted [without completing it]. This is the first. It means that if one hears the name of Bhaiṣajyaguru Buddha and single-mindedly upholds it without giving rise to doubt, there is no possibility that one would fall into bad destinies.