With Mercury in Aries, the person speaks frankly: they tend to judge quickly and to say what they think before weighing every element. Sincerity weighs heavily, and diplomacy may take a back seat. Sometimes a glance or a brief explanation is enough for them to say “got it,” even though there are still aspects left to understand.
Their confidence in their own speed can lead to errors of judgment. Their expression is direct, cutting and, at times, abrupt. That bluntness does not always mean an intention to hurt, although its effects on the other person need to be acknowledged.
When they get angry, they may say a lot and then quickly leave the upset behind. They might criticize someone harshly and soon afterward pick up the friendship again. A sentence spoken in the heat of anger does not always define what they will think later: letting off steam in the moment can be different from a settled position.