注大乘入楞伽經 4.15

4.15

此明修四如實行，成上四種法門。謂觀自心所現行，成上一切法空門也。遠離生住滅見行，成上無生法門也。善知外法無性行，成上無自性法門也。專求自證聖智行，成上無二門也。是名菩薩成就四法，得修行者如實大方便，故勸汝當勤行修學。

This clarifies the practice of the four authentic cultivations, accomplishing the above four kinds of Dharma-gates. That is to say, the practice of observing the manifestation of one's own mind accomplishes the above gate of the emptiness of all phenomena. The practice of being far removed from views of arising, abiding, and ceasing accomplishes the above Dharma-gate of non-arising. The practice of skillfully knowing that external phenomena lack intrinsic nature accomplishes the above Dharma-gate of having no intrinsic nature. The practice of exclusively seeking the noble wisdom of inner realization accomplishes the above non-dual gate. This is called a bodhisattva accomplishing the four dharmas and attaining the practitioner's great authentic skillful means; therefore [the sūtra] exhorts: 'You should diligently practice and train in this.'