Necessity is the Mother of Invention

The meaning of the quote above is that we only invent things because we need to. Like when our ancestors learned how to hunt, they learned to do so because they needed it in order to survive. Same can be said for clothing, transportation and shelter. We only discovered/ invented those things because we need them. These necessities drove us to discover and invent new things for without necessity we would not have a reason to invent something.