The Delphic maxims are a set of moral precepts that were inscribed on the Temple of Apollo in the ancient Greek precinct of Delphi. The three best known maxims – “Know thyself”, “Nothing in excess”, and “Give a pledge and trouble is at hand” – were prominently located at the entrance to the temple, and were traditionally said to have been authored by the legendary Seven Sages of Greece, or even by Apollo. In fact, they are more likely to have simply been popular proverbs. Each maxim has a long history of interpretation, although the third of the set has received comparatively little attention.
Correct. “Nothing to excess” is actually one of the three primary Delphic maxims.
https://en.m.wikipedia.org/wiki/Delphic_maxims