The philosophy of being

The choice of the basis of metaphysics is of capital importance. This basis ought to guarantee the very existence and the validity of metaphysics, while given this science at the same time its formal object and a solid foundation. But if metaphysics is bound up with the study of a universal unity or of the totality of things, and if then, our inquiry ought to be concerned with the whole, how can we determine the choice of a point of departure?