Any plan conceived in moderation must fail when the circumstances are set in extremes. – Klemens Von Metternich

It is the sign of a great mind to dislike greatness, and prefer things in measure to things in excess. – Seneca (Seneca the Elder)

That moderation which nature prescribes, which limits our desires by resources restricted to our needs, has abandoned the field; it has now come to this — that to want only what is enough is a sign both of boorishness and of utter destitution. – Seneca (Seneca the Elder)