It is based on a writing in "Muryojukyo Ubadaisha Ganshoge" (Verses on the Aspiration to Be Born in Pure Land) (also known as "Jodoron" (A Treatise on the Pure Land Sutra), "Ojoron" (A Treatise on Reborn)) by Seshin, that he had told Shaka he would devote himself, from bottom of his heart, to Amida Nyorai, so he wished to be in the Pure Land, showing his belief.
世親が『無量寿経優婆提舎願生偈』（『浄土論』・『往生論』）に、世尊我一心帰命尽十方無礙光如来願生安楽国と著し、自己の信念を表したことに基づく。