Schopenhauer reserved his most unqualified damning condemnation for Hegel, whom he considered less worthy than Fichte or Schelling. Whereas Fichte was merely a windbag ("Windbeutel"), Hegel was a "commonplace, inane, loathsome, repulsive, and ignorant charlatan." The philosophers Karl Popper and Mario Bunge agreed with this distinction. Hegel, Schopenhauer wrote in the preface to his "Two Fundamental Problems of Ethics," not only "performed no service to philosophy, but he has had a detrimental influence on philosophy, and thereby on German literature in general, really a downright stupefying, or we could even say a pestilential influence, which it is therefore the duty of everyone capable of thinking for himself and judging for himself to counteract in the most express terms at every opportunity."