Abstract
A non-dual ontology of Self shares the difficulty of any systematic order: it has presuppositions that it cannot represent within its system. For most theoretical concerns, this problem is trivial. For the non-dual philosophies of Śaṅkara and Nishitani, on the other hand, it points to a central aspect: their thinking rests on a radical turn of experience whose existential dimension cannot be represented in their propositions but can very well be expressed. Along the relationship between personality and impersonality, the contribution will trace this expression and thus point to the fruitful superfluity of a non-dual philosophy that can be exhausted neither in theory nor in practice.