Nothing in excess

Moderation is the process of eliminating or lessening extremes. It is used to ensure normality throughout the medium on which it is being conducted. Common uses of moderation include:

Moderation is also a principle of life. In ancient Greece, the temple of Apollo at Delphi bore the inscription Meden Agan (μηδὲν ἄγαν) - 'Nothing in excess'. Doing something "in moderation" means not doing it excessively. For instance, someone who moderates their food consumption tries to eat all food groups, but limits their intake of those that may cause deleterious effects to harmless levels.

According to the historian and sociologist of science Steven Shapin:

From the pre-Socratics through the Hippocratic and Galenic corpus, and in the writings of such Stoic philosophers as Epictetus and Seneca, health was seen to flow from observing moderation – in exercise, in study, and in diet.

Similarly, in Christianity, moderationism is the position that drinking alcoholic beverages temperately is permissible, though drunkenness is forbidden (see Christianity and alcohol).

In the Book of Wisdom moderation is listed among the greatest virtues.

Moderation is considered a key part of one's personal development in Chinese Taoist philosophy and religion and is one of the three jewels of Taoist thought. There is nothing that cannot be moderated including one's actions, one's desires and even one's thoughts. It is believed that by doing so one achieves a more natural state, faces less resistance in life and recognises one's limits. Taken to the extreme, moderation is complex and can be difficult to not only accept, but also understand and implement. It can also be recursive in that one should moderate how much one moderates (i.e. to not be too worried about moderating everything or not to try too hard in finding a middle ground).

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Wikipedia