阿彌陀經通贊疏 3.30

3.30

答：「王言是勅，佛語成經，既稱讚於淨方，此說便成經也。或可佛所護念者即指釋迦所說阿彌陀經也。」

Answer: "A king's words are an edict, and a Buddha's words become a sūtra; since they praise the pure realm, this proclamation itself becomes a sūtra. Alternatively, 'protected and kept in mind by the Buddhas' may refer directly to the Amitābha Sūtra spoken by Śākyamuni."