Earning a source of income is vital for every person, no matter who this person is. You can be the richest person in the world and still you'd have to have an income coming your way, as with money comes unlimited wants and in order to be able to fulfill these wants you constantly have to have money and since money is always limited you need to keep on earning more and more. And if you aren't super rich, then you definitely need to have an earning to be able to have the necessities of life.