Sagittarius is a dual fire sign ruled by Jupiter, which is considered to be the most benefic of all planets in astrology. Despite an inimical relationship between Jupiter and Mercury, this placement turns out well for the native because both the planets are benefic in nature and bring positive results. People with Mercury in Sagittarius have a liberal approach in life. Mercury also employs them with the art of tact and diplomacy. They are quite driven towards spirituality and more so towards reading about spirituality.
Native also has a strong penchant to visit religious places and books. They have a philosophical bent of mind, so enjoy such prudent discussions. Psychology and religion also appeal to them as subjects of study. Mercury gives the skill of eloquent communication to the native here. Such a person is a skillful speaker, mostly expert in writing. Foreign cultures and languages usually fascinate such people. Their imagination is quite fertile and interesting. These people become good storytellers and can adopt authorship as a profession too because their ideas are most often compelling and luring.