大方廣圓覺修多羅了義經略疏 2.98

2.98

If one encounters the teachings of false teachers, one clings extremely firmly to the two selves of person and phenomena, which is called 'deep.' If one encounters persons of the two vehicles who teach the principle of the emptiness of persons, although they have not yet departed from ignorance regarding phenomena, they have no firm clinging regarding persons, which is 'shallow' compared to the former. If one encounters bodhisattvas and buddhas, their relative depths can be known by comparison.