Scorpios are the most intense, profound, powerful characters in the zodiac. Even when they appear self-controlled and calm there is a seething intensity of emotional energy under the placid exterior. They are like the volcano not far under the surface of a calm sea, it may burst into eruption at any moment. But those of us who are particularly perceptive will be aware of the harnessed aggression, the immense forcefulness, magnetic intensity, and often strangely hypnotic personality under the tranquil, but watchful composure of Scorpio. In conventional social gatherings they are pleasant to be with, thoughtful in conversation, dignified, and reserved, yet affable and courteous; they sometimes possess penetrating eyes which make their shyer companions feel naked and defenseless before them.
Scorpios need great self-discipline, because they are able to recognize the qualities in themselves that make them different from other humans, and to know their utterly conventional natures can be used for great good, or great evil. Their tenacity and willpower are immense, their depth of character and passionate conviction overwhelming, yet they are deeply sensitive and easily moved by their emotions. They can harness their abundant energy constructively, tempering their self-confidence with shrewdness and their ambition with magnanimity toward others provided they like them. They relate to fellow workers only as leaders and can be blunt to those they dislike to the point of cruelty. In fact they are not above expressing vindictiveness in deliberate cruelty. Part of the negative side of the Scorpio nature is a tendency to discard friends once they cease to be useful, but the decent native is aware of, and fights this tendency.
Being so gifted, they can find fulfillment in many employments. Their inner intensity can result in the ice-cold self-control and detachment of the surgeon, the concentration of the research scientist, and the heroism of the soldier. Any profession in which analysis, investigation, research, dealing with practicalities, and the solving of mysteries are relevant, can appeal to them. Scorpios feelings are so intense that even when their love is of the highest, and most idealistic kind, they are nevertheless frequently protagonists in tragic, even violent romances, "star-crossed lovers".
You can find more here:
He goes into detail about how Scorpio matches up with other sun signs, and he does a damn good job :)