Mercury in Libra makes the mind rational, balanced, indecisive, comparing, compromising, and esthetic. Thoughts tend to be a series of reasons or arguments the way lawyers or diplomats think and talk. The mind is continually weighing and seeking justice, fairness, balance, harmony, and proportion. The mind is attracted to literature and the arts. Mercury in Scorpio makes the mind probing, shrewd, secretive, resourceful, penetrating, dynamic, investigating, diagnosing, bold, witty, and even sarcastic or biting.
Thoughts tend to be intuitive, psychic, forceful, intense, and acute.
The mind is interested in motivation, mysteries, psychism, death, and mysticism, often asking why. Mercury in Sagittarius is in detriment making the mind roving, versatile, aspiring, broad, exploring, and restless. Thoughts tend to be free, philosophical, religious, and intellectual, attempting to understand principles. The mind likes travel, changes, intellectual stimulation, teaching, athletics, and outdoor activities. Mercury in Capricorn makes the mind methodical, profound, resourceful, cautious, persevering, painstaking, dry, careful, serious, reserved, conservative, traditional, and observant.