Where this comes from
Planet in sign · Moon and Gemini
The line
This Moon feels through words: moods arrive as things to say, and talk itself is the comfort. The nature is quick, curious, and lightly held; restlessness is the tax, and a feeling named too fast can go unfelt.
The passage behind it
Frances Sakoian & Louis S. Acker, The Astrologer's Handbook (1973)
Part I, ch. 6 'Planets in the Signs and Houses', Moon in Gemini
“They are inclined to rationalize their emotions, so that sometimes they do not know what they really feel.”
Harper & Row