He studied Buddhist scriptures and wrote a commentary called 'Sankyogisho (ｔhree sutra annotations written by Prince Shotoku)'; his educational idea, 'ekayana (doctrine that only one teaching, usu. the Lotus Sutra, can lead to enlightenment),' is strongly reflected in it.
経典を研究し「三経義疏」（さんぎょうぎしょ）という注釈書を書いたが、これに彼の教育思想、「一乗思想」が色濃く反映されている。