大般涅槃經義記 4.122

4.122

上來明佛意業作用，下約日、月、星宿三喻明佛身、口二業作用。於中初約日、月二喻明佛身、口化現之用，後約星喻明佛身、口化滅之用。

Above, the activities of the Buddha's mental karma were explained; below, the activities of the Buddha's physical and verbal karmas are explained using the three parables of the sun, the moon, and the constellations. Therein, it first uses the two parables of the sun and moon to explain the functions of the Buddha's physical and verbal manifestation, and later uses the parable of the constellations to explain the functions of the Buddha's physical and verbal cessation of manifestation.