The way he phrased his resignation letter made it sound like his health is rapidly declining and is no longer good enough to serve as the CEO. That, and the Nov

The way he phrased his resignation letter made it sound like his health is rapidly declining and is no longer good enough to serve as the CEO. That, and the November release of his official biography, are both hints that he fears his life is ending soon. "I have always said if there ever came a day when I could no longer meet my duties and expectations as Apple’s CEO, I would be the first to let you know. Unfortunately, that day has come."