中でも天親の『無量寿経優婆提舎願生偈』は、師である法然が「三経一論」と呼び、浄土三部経と並べて特に重んじた。

"Muryojukyo Ubadaisha Ganshoge" by Tenjin was especially esteemed along with Jodo sanbukyo by his master Honen, who called these "Sankyo Ichiron" (three sutras and one book). - Wikipedia日英京都関連文書対訳コーパス

平安末期から鎌倉時代に入ると、法然（1133年-1212年）は、『選択本願念仏集（選択集）』を著して浄土宗を開創し、根本経典を『無量寿経仏説無量寿経』（曹魏康僧鎧訳）、『仏説観無量寿経』（劉宋畺良耶舎訳）、『仏説阿弥陀経』（姚秦鳩摩羅什訳）の「浄土三部経」に、天親の『浄土論』加え制定した（「三経一論」）。

From the end of the Heian period to the Kamakura period, by writing "Senchaku Hongan Nenbutsu-shu (Senchaku-shu)" Honen (1133-1212) established Jodo sect and determined the basic sutras by adding "Jodo-ron" of Tenjin to "Three Sutras of the Pure Land," namely "Muryoju-kyo Bussetsu Muryoju-kyo Sutra" (translated by Sogi Kosogai), "Bussetsu Kan Muryoju-kyo Sutra" (translated by Ryuso Kyoryoyasha) and "Bussetsu Amida-kyo Sutra" (translated by Yoshin Kumaraju) ('Three Sutras and One Theory'). - Wikipedia日英京都関連文書対訳コーパス