大乘起信論裂網疏 4.59

4.59

法身菩薩，謂漸教初歡喜地，頓教初發心住也。所證真如，即是一切如來自體，無二體故。既已分證其體，即必分同其用，故《華嚴》云：初發心時便成正覺，清淨妙法身，湛然應一切也。此後並是無功用道，故云任運修行等。三釋熏習淨法竟。

"Dharmakāya bodhisattvas" refers to the first bhūmi of joy in the gradual teaching, and the first stage of resolve in the sudden teaching. The tathatā they have realized is the own-essence of all Tathāgatas, for there are not two essences. Having already partially realized its essence, they must also partially share its function; therefore the Avataṃsakasūtra states: 'At the moment of first generating the mind, one immediately achieves perfect enlightenment; the pure and wondrous dharmakāya serenely responds to all.' Everything after this is the path of effortless action; hence it says 'cultivating spontaneously,' and so forth. The third part, explaining the perfuming of pure dharmas, is finished.