It was narrated from 'Abdullah bin Mas'ood (رضي الله عنه) that

The Prophet (ﷺ) drew a square, and a line in the middle of the square, and lines beside the line in the middle of the square, and a line outside the square, and he said: “Do you know what this is?" They said. Allah and His Messenger know best. He said: "This is man, the line in the middle, and these lines beside him are the sicknesses and problems that assail him from all places. If one misses him. another will befall him. The square is his death that is surrounding him and the line outside it is his hope.”