 Philosophy on Schlegel’s view must thus begin with skepticism and tend toward the absolute; the idealists have found no way to the latter that avoids the difficulties of the former. Against Fichte’s attempts at system-building, Schlegel proposes a notion of what he calls an alternating proof (Wechselerweis): “In my system the ultimate principle [der letzte Grund] is actually a reciprocal proof [Wechselerweis]. In Fichte’s [it is] a postulate and a conditional proposition” (KA XVIII, 521).