I like to say, “moderation in all things — but not too much.”
In other words, keep your moderation in moderation. This sort of sounds like a paradox, but I don’t think it is. Obsessing over moderation is just as unhealthy as obsessing over anything else. You end up worrying about whether your life is perfectly in balance. It shouldn’t be! It should get a little out of whack. Maybe even a lot out of whack, every now and then!
I think this is just the sometimes-overlooked deeper meaning of moderation.
p.s. In chaos theory terminology, I think this concept is related to the chaotic boundary between uniformity and randomness, which is self-similar at all scales. Moderation modulating moderation (modulating moderation, and so on). Uniformity taking hold and then randomly switching to a different uniformity. Randomness that is uniform — usually. But that’s a blog post for another day.