妙法蓮華經文句 6.8

6.8

Perhaps they once generated the mind [for enlightenment], which is called emerging from the triple world, yet retrogressed again, which is called entering. Just as when a person raises his foot intending to exit by the side of the gate and then turns back, this is both called emerging and called returning within. Furthermore, the essential nature is originally pure and is not an entity of the triple world; on account of ignorance, conceptual proliferations arise and there is birth and death, hence it says "previously entered on account of play".