Mercury governs the mind — perception, language, learning, and the exchange of information. It is how you think, speak, connect ideas, and move between things.
A quick transit that activates thinking and communication around the natal point it touches: conversations, decisions, messages, short trips, and the framing of a situation.
mental focus, dialogue, negotiation, errands, and the way a topic gets named and understood.
Transit Mercury square natal Mars can sharpen the tongue — debate, fast decisions, and the risk of friction in how things are said.