成唯識論了義燈 7.122

7.122

問：既許毘鉢菩薩生色、無色，雖是頓悟，亦依彼身起四善根，應通無色，亦有善根。

Question: Since it is permitted that a *vipāka-bodhisattva is reborn in the form and formless realms, even if they are of sudden awakening, they also rely on that body to generate the four roots of goodness; thus it should extend to the formless realm also having these roots of goodness.