The head and the mouth are Aries' domain, which explains their explosive tempers and lack of self-control. As a result, they say exactly what they mean
You'll never have to wonder how an Aries is feeling, though you may have to duck, wince, or dodge their truth when they're on the upswing.
Although Mercury rules both Gemini and Virgo, the former is much more exacting and sometimes absolutely level in their hyper critical approach to communication than the latter.
One of the most perplexing things about these folks is that they are experts at giving advise but completely incapable of adopting it.
It is the role of intellectuals to speak the truth and expose falsehoods.This is something that many Sagittarius feel a strong sense of obligation to do.
Sagittarius are the people who stand on their soapboxes and shout their opinions from the rooftops, the people who consider the truth as a sacred place that has to be honored regardless of the consequences.