It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) drew a square, then drew another line in the middle of it, and on the right and left of this middle line he drew some more lines, and he drew one line outside the square. He said to the noble Companions (may Allah be pleased with them): "Do you know what this is?" The Companions (may Allah be pleased with them) replied: Allah and His Messenger know best. He said: "The line in the middle refers to a human being, the lines on its right and left are the diseases that keep attacking a person; if one misses, another hits. The square refers to a person's death which surrounds him, and the outer line refers to hope."