In Delphi, as the myth goes, the two eagles sent by Zeus met, searching to find the center of the universe, the navel of the earth. There, the greatest, most magnificent, and most famous sanctuary was created, which became the spiritual center of antiquity. In the unique Delphic landscape, at the temple of the god of light Apollo, the seven sages of antiquity inscribed maxims that formed the code of ethics and behavior of the ancient Greeks, a timeless code, always relevant. The Delphic maxims, or Pythian letters, constitute the legacy of the seven sages to future generations, urging towards a more ethical and spiritual life, encapsulated in the three most important Delphic maxims that dominated the pediment of the temple of Apollo, and which the visitor could easily discern from afar: 'You are in Delphi', 'Know thyself', and 'Nothing in excess'. [Excerpt from the text on the back cover of the edition]