大乘起信論義記 3.8

3.8

謂依菩薩，從初正信發心觀察，若證法身得少分知，乃至菩薩究竟地不能盡知，唯佛窮了。

[The text states:] "It is based on bodhisattvas, who from their first generation of the mind of correct faith observe it; if they realize the dharmakāya, they attain partial knowledge of it; up to the bodhisattva's ultimate ground, they cannot fully know it; only the Buddha completely fathoms it."