大方廣佛華嚴經隨疏演義鈔 78.28

78.28

Regarding the Commentary's stating, "Causing them to truly be mindful of the buddhas of the ten directions": if one does not comprehend mind-only, sees [the Buddha] as coming from outside, and grasps at the limits of form, how could one know that mind itself is the Buddha? If one knows that mind, buddha, and sentient beings—these three—have no distinction, this is true mindfulness of the Buddha. A good spiritual friend said: "Mindfulness of the Buddha is mindfulness of the mind; mindfulness of the mind is mindfulness of the Buddha." The Buddha has no form, and the mind has no arising and ceasing; mind and object are unified, and therefore it is called true mindfulness.