"plentitude—the sufficiency that liberates from need and greed."
Theodore Roszak, The Making of a Counter Culture and The Making of an Elder Culture.
This is a nice way to think about Simplicity. If it doesn't feel liberating, you're not doing it right. I like this because it calls for reflection on our part. There's no rule that tells you that you can't own a car or watch television.... it suggests that you must decide about the point at which you rise above need and greed, that you have enough. This is plentitude.