"He was decisive and wholehearted in everything he did, so intent on the task at hand that he never looked over his shoulder, even if his cloak got caught in a thorny bush. When he did turn to speak to somebody, he used to swing his entire body and address him full face. When he shook hands, he was never the first to withdraw his own. He inspired such confidence that he was known as al-Amin, the Reliable One."