To realize emptiness, we must first have the right understanding: all things are phenomena of the mind; moreover, the mind is inherently empty. Regarding this understanding, there are also many levels, the highest of which is Dzogchen. It is the view in tantra and the third turning of the wheel of Dharma that all worldly phenomena are an illusion and that mind is clear light in essence. This understanding is extremely important.

- Quote from The Logic of Emptiness,"Seeing All External Objects as Phenomena of the Mind"