Reale's monumental work establishes the exact dimensions of Aristotle's concept of first philosophy and proves the profound unity of concept that exists in Aristotle's Metaphysics. Reale's opposition to the genetic interpretation of the Metaphysics is an updated return to a more traditional view of Aristotle's work, one which runs counter to nearly all contemporary scholarship. Reale argues that Aristotle's first philosophy includes a study of being, a study of substance, a study of divine substance, and a study of principles and causes, all of which are integrated and dialectically reconciled.