T'an-luan (early Chinese Pure Land philosopher and popularizer) explains Genso-eko in his main literary work "Muryoju-kyo Ubadaisha Ganshoge-chu" (Commentary on [Vasubandhu's] Upadesa on the Sutra of Immeasurable Life) (also known as Ojoron-chu or Wangsheng lun zhu - Notes on the Treatise about Birth (in the Pure Land)) as follows:
曇鸞が、その主著『無量寿経優婆提舎願生偈註』（『往生論註』）の中で、下記の通り「還相回向」を釈している。