Martin Heidegger "Ontologically, Da-sein is in principle different from everything objectively present and real. It's 'content' is NOT founded in the substantiality of a substance, but in the 'self-constancy' of the existing self whose being was conceived as care... Along with this, we must establish what possible ontological questions are to be directed toward the 'self', if it is neither substance nor subject."
So again, it seems like action instead of being is the foundation of the world for him. Very modern. Also sounds Buddhistic