 What do we find in the human mind? Representations on the one hand, and tendencies, inclinations, or strivings on the other, according to Leibniz. Or, to put this in Leibniz’s more customary terminology, what is found within us is perception and appetition. Human minds count for Leibniz as simple substances, and, as he says in a letter to De Volder of 30 June 1704, “it may be said that there is nothing in the world except simple substances, and, in them, perception and appetite” (G II, 270/A&amp;G 181).