Moderation
"Moderation in all things is the best policy." -Plautus, 250-184 bc; paraphrasing Hesiod, c. 700 bc
It has been a well-known moral imperative for at least 3000 years that moderation is the key to happiness and well-being.
Moderation allows for indulgence in the great pleasures of life like food, sex, money, power, drugs and alcohol, while being aware of their potential for abuse and intentionally avoiding the temptation towards excess and addiction.
Balance of Power is the principle of moderation applied to politics and economics.It is Yin and Yang. Opposing forces create a feedback loop that keeps either one from exerting authoritarian control.
To achieve moderation, it is easier to create an environment that incentivizes it rather than relying on willpower, which doesn't really exist.