Now let me trace this notion as I found it.
All sane men can see that sanity is some kind of equilibrium; that one may be mad and eat too much, or mad and eat too little.

Some moderns have indeed appeared with vague versions of progress and evolution which seeks to destroy the [Greek: meson] or balance of Aristotle.

They seem to suggest that we are meant to starve progressively, or to go on eating larger and larger breakfasts every morning for ever.

But the great truism of the [Greek: meson] remains for all thinking men, and these people have not upset any balance except their own.

But granted that we have all to keep a balance, the real interest comes in with the question of how that balance can be kept.