Quotes from AstroGraph.com

The ruling planets for Scorpio are Mars and Pluto. Mars is the planet of outward activity and animal passion. When strong in the chart it can indicate a volatile temper, and also great courage. Pluto is related to will, and intense passion, and has a reputation for ruthlessness. As god of the underworld Pluto brings the deepest compulsions into the light. Its position indicates areas of life that must ultimately become transformed as part of the soul's evolution.

Scorpio is the most intense sign of the Zodiac, and is associated with sexual activity and with the symbolism of death and rebirth. Their emotions run deep. They may suffer in life, but their pain leads to important personal transformation. Scorpios are a shrewd judge of other people's motives. When they work out their issues to be more in line with their own higher nature, they can take on the charismatic power of a natural healer, transforming themselves and society around them.