維摩經玄疏 4.75

4.75

是則精修觀心，洞解一切經論。若經論不從心出者，觀行之人既不聽不讀，何得內心通達耶！此乃有所言說，寘與經論相應，意在此也。

Thus, by meticulously cultivating the contemplation of mind, one thoroughly understands all sūtras and treatises. If sūtras and treatises did not emerge from the mind, then since a practitioner of contemplative practice neither listens nor reads, how could their inner mind achieve thorough comprehension? When there is discourse, it matches the sūtras and treatises—this is what is meant.