大方廣圓覺修多羅了義經略疏 2.522

2.522

These three approaches all give rise to contemplative practice based on awakening to pure perfect enlightenment, and the contemplative practices all enter into perfect enlightenment; never departing from beginning to end, they are thus said to 'draw near to and accord with'. Buddhas and bodhisattvas equally realize and equally cultivate them, yet according to capacity and matter, their practical marks differ individually. Either many persons together cultivate one approach, or one person completely cultivates many practices—whether three or five, or hundreds and thousands—their similarities and differences are hard to standardize across categories, yet they must all rely on these three kinds of undertakings. Among the three kinds of undertakings, one may rely completely on three, or on one, or on two; simultaneously, sequentially, singly, repeatedly, or intermingled, fully as explained in the twenty-five wheels. These are the undertakings of the practitioner.