Abstract
In February 1686, Gottfried Wilhelm Leibniz sent a letter to Antoine Arnauld, via their mutual friend Ernst, the Landgrave of Hessen-Rheinfels. This letter contained a short summary of Leibniz's most recent philosophical work, the Discourse on Metaphysics, and asked Arnauld for his reaction to it. Arnauld's response was extremely harsh: he called Leibniz's views shocking and useless and advised him to stop engaging in metaphysical speculations. Yet, Leibniz did not let this discourage him. In the exchange that followed, Leibniz was intent on convincing Arnauld that the views contained in the Discourse are well supported and less radical than Arnauld initially thought. And while he never convinced Arnauld...