The Heart Sutra says that the realization of Emptiness is when...
Form = Void and Void = Form
Norbu and the Heart Sutra are saying the same thing, but just describing it coming from different perspectives.
The Dzogchen usage of "essence" is the same as the classic usage of void. The void is empty with no activity at all. Nothing to perceive and nothing to sense. Like a totally dead sea with no motion. This same meaning is found in the first half of the Heart Sutra. The statement of Form = Void means that one breaks down (or perceives past) form until one notices the Void underneath it all. It is similar to when you look at a blackboard you only notice the writing in chalk. But if you erase the board a little, you start to notice that the chalk is really in/on the blackboard.
The Dzogchen usage of "energy" is the same as used in other traditions, the difference just being that in Buddhism, energy practices are started much later in the path which results in smaller swings compared to other tantric traditions. The same point of energy is found in the second half of the Heart Sutra. Void = Form means that energy "emerges" from the void and is a component of the void. In the blackboard analogy, this is the creation or writing on the blackboard.
The Dzogchen usage of "nature" is what is often called "light". It is the pristine clarity of the void. Or in more modern terms, it is the structure or raw building stuff of mind/universal mind. In the Heart Sutra, it is what is "realized" when one integrates and realizes both of the individual components of the Heart Sutra.
Ultimately, void is nothingness, energy is the motion of nothingness, clarity (or light) is the realization of the potential of it all.
http://community.livingunbound.net/i...e-heart-sutra/
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