Arsibalt's explanation of "Sconic thought" is a decent enough summary of some of the problems explored by Kant in the Critique of Pure Reason, regarding both the fact that we cannot directly access knowledge concerning the world outside our heads, and the fact that certain questions are, by their nature, unanswerable by human reason.
This also ties in once again to twentieth-century work related to the demarcation problem, which attempted to put all such metaphysical questions "out of bounds".