Kantian Gloom-Watch: Dialecticians of Valhalla Edition

A nice passage from the first Critique:

There is properly speaking no polemic in the field of pure reason. Both parties beat the air, and wrestle with their own shadows, since they go beyond the limits of nature, where there is nothing that they can seize and hold with their dogmatic grasp. Fight as they may, the shadows which they cleave asunder grow together again forthwith, like heroes of Valhalla, to disport themselves anew in the bloodless contest.

Kant, A756=B784