Present awareness is primordial purity, an immense boundlessness. You must understand that the essence of awareness is emptiness. Not realising this, if you attempt to acquire emptiness from somewhere else and place this patch of emptiness onto the essence of awareness, which is empty, this is what is meant by the first straying point. One has made emptiness into an object of knowledge, and this is straying into emptiness' having the character of a knowable object, the first straying point.

-- Nyoshul Khen Rinpoche