Shinran preached the Religious Conversion through Amida's Three Vows whereby, as this kasui no gan explained, one should master Kemon (Expedient Means), as represented by Vow 19, followed by Shinmon (Truth) as represented by Vow 20, and then move to Gugan (Immense Profession generally referring to the 48 Vows) as represented by Vow 18.
この果遂の願のままに、第十九願の仮門から第二十願の真門に入り、第十八願の弘願に転入する三願転入を説く。