In the days of ancient commentaries it was attempted to explain the theme from the Buddhist perspective, stating that 'it takes the 60-volume Tendai as a model,' or 'it represents the idea of Isshin-sankan (Tendai-shu sect's Contemplation), and there were also many Confucianist and Taoist explanations based on the various old, respected Chinese classics like "Shunju History Book," "Soshi" and "Shiki Chinese History Book," thus constituting the dominant view in those days.
古注釈の時代には「天台60巻になぞらえた」とか「一心三観の理を述べた」といった仏教的観点から説明を試みたものや、『春秋』、『荘子』、『史記』といったさまざまな中国の古典籍に由来を求めた儒教的、道教的な説明も多くあり、当時としては主流にある見解と言えた。