 In his Repastinatio dialectice et philosophie, which is extant in three versions with slightly different titles, Valla attacks what he sees as the foundations of scholastic-Aristotelian philosophy and sets out to transform Aristotelian dialectic. As the title of the first version clearly indicates, he wants to “re-plough” the ground traditionally covered by the Aristotelian scholastics. The term repastinatio means not only “re-ploughing” or “re-tilling” but also “cutting back” and “weeding out.” Valla desires to weed out everything he regards as barren and infertile in scholastic thought and to re-cultivate the ground by sprinkling it with the fertile waters of rhetoric and grammar. His use of repastinatio indicates that he is setting out a program of reform rather than of destruction, in spite of his often aggressive and polemical tone. Book I is devoted mainly to metaphysics, but also contains chapters on natural philosophy and moral philosophy, as well a controversial chapter on the Trinity. In Books II and III Valla discusses propositions and forms of argumentation such as the syllogism.