This happens, in part, when you can’t really do very much with any more. In our American culture, that recognition seems more rare than not. Pretty obviously, though, this is a function of the consumer orientation we’ve developed about our existence.
Enough is actually not very much. But, the appetite we create for more, more, more is ultimately ravenous…it even feeds on itself without us even realizing it. There is a point at which you can’t do anything, at least substantively, with more.
More actually takes us in the opposite direction, primarily because it takes us away from our need, both our sense of it and what that actually is. Perhaps this is what is substantively behind the trope 'more is less'. It buries us. It hides us from ourselves. It fills what needs to be filled with things that make us less.
We don't need more because it prevents us from knowing what we really need.
How we find what we need is conspicuous. We should take note of that and let it lead us in a deeper recognition of, and the better questions about, what is truly enough.
Ultimately, this happens to us as we are naturally reduced over time by our capacity to handle more (or, even the same amount)…unless we simply choose to ignore it.