"The lower spheres are so polluted that one could say without exaggeration that meteoric dust is being oxidized because of the chemical reactions of psychic energy, which first of all act upon metals… Of course, the pollution of the spheres closest to our planet is disastrous. The lower subtle bodies loiter about like swindlers at a bazaar and thereby prevent the successful formation of a spiral of constructive effort. One has to harbor a special aspiration in order to penetrate beyond the bounds of these dreadful deposits. So we should not believe that there might be thoughts without consequences; even the largest cup can be overfilled! This especially applies to rotation, when gravity holds back many particles of lighter weight. So when We speak about the vital need to purify psychic energy through refinement of thought, We have in mind the purification of the lower spheres. To borrow the language of the Church, it is necessary to conquer the infernal hordes."