Namdrol wrote:The Vajrayāna view of awakening is that awakening is very much based in the body as this passage from the Hevajra Tantra shows. The key to awakening in Vajrayāna in general is embodiment. The mind/matter dualism (ala Decartes) we find in sutra is superceded in Vajrayāna, that is the key to why Vajrayāna is more rapid.
I'm not sure that I agree with your interpretation of this passage exactly. But any how the point with vajrayana is that embodiment implies the deluded self is replaced with an alternative self - the deity. Obviously for this path to be genuine the deity (as embodiment) has to be seen as inconceivable. Certainly not identified with with concepts.
A brain can't hold the knowledge of a buddha. A brain is limited and finite. So the point for me is to go beyond thinking mind - go beyond brain-based reasoning.
Truly buddhas don't have brains otherwise they would be limited - Shakyamuni died did he? But what buddhas have instead of brains is inconceivable. The deity is inconceivable - it is not an object of knowledge.
It is the inconceivable that I take to be the main focus of my practice. This is what I take from discussing the importance of the brain. That what is brain-based is false that knowledge of 3 times is false. That whatever my limited brain-based view perceives is not mistaken for the ultimate - and that would include the 4 visions.