The number 6 represents animals and the number 5 represents human beings. When human beings stand with their arms and legs spread out, they fit in the shape of a five-pointed star, the pentagram.
The 5 thus represents humans who have rid themselves of their animal nature which is symbolized by the tail; and they must bring the 5 alive in them by working with the five virtues of the pentagram: wisdom, love, truth, kindness and justice.
It requires great effort to evolve from an animal to a human, from the 6 to the 5, because human nature is still so close to the animal nature with all its instincts and appetites. We all drag our animal past along with us: cunningness, brutality, cruelty, voracity and sensuality, and we will never be able to rid ourselves of it completely.
But each one of us can seek to control all these instinctive tendencies by developing our spiritual faculties that will truly make us humans.