Gottfried Wilhelm Leibniz Quote

Only geometry can hand us the thread [which will lead us through] the labyrinth of the continuum's composition, the maximum and the minimum, the infinitesimal and the infinite; and no one will arrive at a truly solid metaphysics except he who has passed through this [labyrinth].

Dissertatio Exoterica De Statu Praesenti et Incrementis Novissimis Deque Usu Geometriae (1676)