Mercury in Scorpio.
Mercury the planet of communication in the fixed and sharp sign of Scorpio seems designed to introduce itself like a missile of those that pierce the hardest cement, except that the missile of this type of configuration is above all mental, the fixedness of this configuration is in the iron will that feeds people born under it, they want to extract the essence of a matter and they do not stop drilling under the appearances that mask them.
With Mercury in Scorpio you can be a good detective literally or metaphorically speaking, you can have natural aptitudes for psychology or the occult sciences, the latter can feed your voracious investigative appetite.
For people born with Mercury in Scorpio it is easy to find the weak point of an opponent and if they present other less benevolent configurations use it as a throwable weapon, but with good aspects it gives a natural intelligence for medicine and research.
They are people prone to holding firm on an idea, and if this natal configuration is on the sector of the concrete mind (house 3) they can spend a whole life investigating some subject that they are passionate about, becoming true experts in any branch of knowledge.
Scorpio represents among other things everything that is covered or set apart from ordinary vision, and this includes sex, for people born with Mercury in Scorpio thinking about sex is something natural, also thoughts about death or the hereafter, whether these are morbid or liberating in nature will depend on the rest of the natal horoscope.
It is a good idea to make reliable deals and with all points clarified on the table with these people, because if their sharp intuition to reveal secrets turns on the alert light things can get ugly.
There is a certain magnetism in their words, which can make them skilled manipulators of the word or the written word, or simply intuitive salespeople, but in any case with good configurations backing Mercury in Scorpio you can already make clear that you have checkmate advanced before we realize it.
Mohandas Gandhi had Mercury in Scorpio and in the first sector, even close to the ascendant, which gave him mental capacity to influence others and a great will backed by the presence of Mars and Venus in the same sign and a complete compendium of fixed energy. He found the weak points of the system and used them in the best way, he had an evident interest as his biography highlights it in sex and death, and his communication was undoubtedly the most original, influencing people clearly emotionally, Scorpio is a water sign. He knew how to search in the most intimate of the human soul, and above all he knew how to find under the apparent muddy slime the purity of the interior of man and his power to transform the world.