The following is drawn from the writings of the holy Alshich:

How can one speak before the King of kings with a mouth which utters forbidden talk? Would not God, as it were, respond, “Who is this shameful person who dares to beg forgiveness of his sins with a lowly tongue? Would he dare serve an earthly king with vessels which are covered with grime? Surely the king would punish him severely for such disgraceful service!”