 The third point is the most well-known, and is considered in detail in the entry on  Kant’s critique of metaphysics.  Kant demolishes a series of supposed proofs of the existence of God (“The Ideal of Pure Reason”) and the soul (“The Paralogisms”). He also demonstrates that it is equally possible to prove some judgments about “world wholes” as it is to prove their opposites, such as the claims that space must be unbounded and that it must be bounded (“The Antinomies,” including the idea of an absolutely first cause: the problem of freedom as it is posed in the famous “Third Antinomy”). These sections have always been regarded as among the most convincing parts of the first Critique. Mendelssohn spoke for many of Kant’s contemporaries in calling him the “all destroyer,” for devastating reason’s pretenses to transcendent insight.