Mars represents our desire and drive—how we assert ourselves in the world. Mars and the Sun share some commonalities in that both represent our physical and spiritual vitality as well as our strength of will power, courage and leadership.
The difference between the two is that while the Sun describes the identity we are developing, Mars is about how we go about developing and asserting that identity.
Mars has much to do with goal setting, ambition, and our ability to take action; it describes the passion we have, our rawest desires, and, more importantly, how we go about getting what we want.
Are we committed or uncertain about our desires? Are we passive aggressive, or assertive in going after what we want? Are we patient or impulsive in our approach?