but when iabi handed him a piece of black cloth to tie around his eyes ( which both he and the old man did next , because if the stone was restored to its original brilliance it would blind them ) , yodren urged himself to be confident , if for no other reason because to show a lack of faith now could worsen yonfis already diminishing spirits and influence the effect of his powers powers that shouldnt be toyed with , powers to which he owed his very life .