  Fortunately Dietrich concentrated his analysis of the key concepts of his metaphysics in two relatively short treatises, De ente et essentia and De quiditatibus entium. As a result it is not necessary to reconstruct his metaphysics by searching for the metaphysical presuppositions of the entire body of his philosophical writings, as is often the case with other philosophical writers. In fact one of the characteristics of Dietrich as a thinker is the systematic way in which he not only orders his thoughts but his treatises as well. And so we need only consider these two works in order to discover his particular view of being, essence and quiddity that specifies his philosophical thinking.