Its origin derives from the name of the opening chapter of "Ojoyoshu (Buddhism book)" by MINAMOTO no Makoto (a court noble), the content of which shows the basic characteristics of the thoughts of the Jodo sect as well as Gongujodo.
語源は、源信(公卿)の『往生要集』冒頭の章名に由来するが、その内容は欣求浄土とともに、浄土教思想の基本的特質を表している。