What is the sign of God's messenger?

Gemini is ruled by Mercury, the mythical messenger of God. It endows Gemini with agile thinking ability, and Gemini is known as "the most flexible and intelligent constellation" with its highly developed brain. They are born optimists, full of energy, but extremely dual, often tormenting his nervous system and making them fidgety. They often have the upper hand by virtue of their flexibility and inclusiveness. They flow like air. You can only breathe them and feel them, but you can't catch them.