おろかもの!!!この洞窟に入れるのは、ぼろをきた心のきよらかなわかもの、ただひとりだ!
I need help in understanding what ぼろ means and the phrase/clause that follows.
I still haven't figured out what きよらかな is.
Also, I believe おろかもの means "fool" or "idiot". It must be extremely degrading to be called that in a real conversation, doesn't it?