Gently though Esau continued to speak to his father, he yet longed for his end to come. But Isaac was stricken with spiritual as well as physical blindness. The holy spirit deserted him, and he could not discern the wickedness of his older son. He bade him sharpen his slaughtering knives and beware of bringing him the flesh of an animal that had died of itself, or had been torn by a beast, and he was to guard also against putting an animal before Isaac that had been stolen from its rightful owner. "Then," continued Isaac, "will I bless him who is worthy of being blessed."