When Sa'adi was traveling to Persia, footsore because he had to walk with bare feet in the hot sun, it was so painful to walk that he was thinking, "There can be no one in the world who is so wretched and miserable as I." But two minutes did not pass before he came across a person whose feet were both useless, so that he was crawling along the ground and only progressing with great difficulty. This caused a prayer to rise in Sa'adi's heart, and he became thankful he was not afflicted like that. He thought, "If I have no shoes, at least my feet are healthy and sound."