Son, sustenance is of two types, one that you seek, and the other that seeks you. Thus if you do not seek sustenance it will seek you. In the world your share is to that extent which can stand you in good stead in the Hereafter. If you grieve even what you have lost, then you should grieve over everything, which you have not got. Do not be like those people who are not impressed by any advice, but are moved by accusations. A wise man takes a lesson from even an ordinary lapse.