Ex istence and Being Sou rce: Ex istence and Being from Ex istentialism from Dostoy ev sky to Sartre edited by Walter Kaufman published in full. Descartes, writing to Picot, who translated the Principia Philosophiae into French, observed: "Thus the whole of philosophy is like a tree: the roots are metaphysics, the trunk is physics, and the branches that issue from the trunk are all the other sciences . . ." Sticking to this image, we ask: In what soil do the roots of the tree of philosophy have their hold? Out of what ground do the roots-and through them the whole tree-receive their nourishing juices and strength? What element, concealed in the ground, enters and lives in the roots that support and nourish the tree? What is the basis and element of metaphysics? What is metaphysics, viewed from its ground? What is metaphysics itself, at bottom? Metaphysics thinks about beings as beings. Wherever the question is asked what beings are, beings as such are in sight. Metaphysical representation owes this sight to tho light of Being. The light itself, i.e., that which such thinking experiences as light, does not come within the range of metaphysical thinking; for- metaphysics always represents beings only as beings. Within this perspective, metaphysical thinking does, of course, inquire about the being which is tho source and originator of this light. But the light itself is considered sufficiently illuminated as soon as we recognise that we look through it whenever we look at beings. In whatever manner beings are interpreted-whether as spirit, after tho fashion of spiritualism; or as matter and force, after the fashion of materialism; or as becoming and life, or idea, will, substance, subject,...