The sign of Gemini, light as the air that gives it character, is the sign of the dual¹ personality. The average Gemini person is not the extreme case of split personality, where the subject dramatically changes from good Dr. Jekyll, to evil Mr. Hyde. But the Gemini native has, more than any other kind of person, two distinct natures. They blow hot and cold, are "with you, and agin’you," or they are sunshine and showers. All of these variable dispositions²（性情，处理） are round in Gemini more than in any other Zodiacal type.

At best, they are many-faceted people, sparkling, brilliant, and hard, like diamonds. They have the mental qualities inspired by the sing ruler, Mercury, fleet-footed messenger of the gods. This influence makes them intellectual, analytical³, full of wit and accomplishments⁴. The Gemini mind is impersonal⁵, and never guided in decisions by emotions, of even qualities of right or wrong. But they do have a very wide stripe of common sense in their make up. They can think problems out for other people, for their approach is always rational, though cold.

Again, the influence of Mercury makes them very capable people. They can turn a hand to anything, and do it well. They always have a professional touch, and are nimble（敏捷的） -fin-gered, skillful and adroit⁶（灵巧的） . They move quickly and gracefully⁷ and are impatient with anything but high speed.