If you want something you covet it, however, after you get what you want you may get board with it and throw it away. If you truly need something in your life you will never stop using it. You will always need it in a sense. Water sure, you need it to survive, but what about someone like a parent. you might move away but then you will still need to see them. you might say, "but what if your parents pass away? I've lived without my parents for a while now." Well you still think about them, you still miss them because they're gone and that's because you need them.