Conversation so far:
What was  Gottfried Wilhelm Leibniz philosophy?
In philosophy, Leibniz is most noted for his optimism, i.e. his conclusion that our universe is, in a restricted sense, the best possible one that God could have created.

Question: What else did Gottfried Wilhelm Leibniz believe?
Self-contained rewrite: What else did Gottfried Wilhelm Leibniz believe besides his optimism philosophy?