Some more.... from the chapter on Spontaneity. The books is free to read online.
"From the perspective of Dzogchen, Tantra and Sutra are not seen as lesser vehicles – it is a question of pragmatics and being genuine about the view one is able to live at any moment in time. The most efficacious practice is always that which enables one to return to openness, and to the possibility of the direct experience of the non-duality of emptiness and form.
One method we can employ is an examination of the three spheres of being. It is useful to look at the three spheres, as an expression of the way in which we exist. We can tease apart recognisable aspects of ourselves in order to understand how we can engage with these aspects in practice.
The three spheres of being are chö-ku, long-ku and trül-ku, which can also be referred to as emptiness, energy and form, or mind, speech and body.
The vast empty potential of mind—Sky Mind—is not conditioned by any limitation of form. Form can arise in any manner, but it does not colour Sky Mind in any permanent or definitive way. This is chö-ku.
Energetic form manifests intangibly. In Sky Mind there is movement of thought, emotion, sensation, ideation; and this movement has the nature of energy. This sphere is communicative and encompasses speech and visualisation, sound and light. This is long-ku.
We can become aware of the sphere of tangible form through contact with the sense fields. In this sphere of being we touch, hear, taste, see, and smell. This is the sphere which communicates at the level of body. This is trül-ku4.
Realisation and transformation can be actively cultivated in all three spheres. The spheres of being are in fact all spontaneously present and inseparable, as aspects of what we are, but we talk about them individually to facilitate understanding. "