ɪn hɪz lˈeɪɾɚ jˈɪɹz, hiː wʌz ɪmpɹˈɪzənd fɔːɹ ɹˈaɪɾɪŋ deɪɡˈɑːkuː wˈækjuːmən, wˌɪtʃ kəntˈeɪnd kɹˈɪɾɪsˌɪzəm ʌv tˌoʊkjuːɡˈɑːwə ʃˈɑːɡənˌeɪt pˈɑːlətˌɪks.
In his later years, he was imprisoned for writing Daigaku Wakumon, which contained criticism of Tokugawa shogunate politics.