"The fundamental commitment behind Abelard's nominalism, that there is nothing that is not individual (or at least particular), is the conceptual core of all his metaphysical thought. Abelard held that the individual is primary, ontologically basic, and requires no explanation. It is notoriously difficult to prove such a claim. If Abelard could be said to have a metaphysical project it would be to show that other "items" that more promiscuous philosophers would add to their ontology can be reductively explained in terms of individuals (or at least of particulars)."