When you are discontent, you always want more, more, more. Your desire can never be satisfied. But when you practice contentment, you can say to yourself, 'Oh yes - I already have everything that I really need.'
Because there is that sort of feeling that people don't know what to do with gaps in their lives. It's a scary notion, but actually, if you can stand in space just for a little while, a new door will open, or you'll be able to see in the dark after a while. You'll adjust.