The nature of all things, without any exception, is that they lack true existence. Just as there is no place which is not pervaded by the sky in space, there is no place not pervaded by Emptiness. 

‘Inexpressible mode of being’ means a fully realised Arya’s understanding of Emptiness cannot be described in any words, and it cannot be explained how such an Arya arrived at that understanding.

-- Ling Rinpoche