The fire signs represent our vital energy to create and push us into the future.
Fire is the energy of life to grow and expand.
It's the life force that we use to create our future with desire and the will to create. The six signs of Fire and Air are future oriented. The ancients called them masculine to represent this force into a new direction. Note that Fire signs are always opposed by Air signs. These are qualities of duality that speak of the unity that bind Fire to Air and yet express this quality in opposite expressions.