佛祖統紀 1.28

1.28

人理教行。具足成就。由五濁以登九品者。唯念佛三昧之道為能爾。末代機宜。始自廬阜。作淨土立教志三卷。

People, principle, teaching, and practice fully accomplished, ascending from the five turbidities to the nine grades—this can only be done through the path of the mindfulness-of-Buddha samādhi. Being appropriate for the capacities of the degenerate age, it began at Mount Lu. I have composed the Treatise on the Establishment of the Pure Land Teaching in three fascicles.