Souls of all men unite into one soul, representing man. The souls of all women unite to become one soul, representing a woman and these two parts join together to become one soul. Such is the union between Adam and Eve, which the Creator intended from the beginning. We are not talking about a man and woman in this world, but about two parts of a structure in a spiritual whole, two parts of one soul, which unite to form the perfect spiritual object, a vessel that is completely filled with all the Upper Light and good, which the Creator intended.
It means that the difference between people on the corporal level is only in their uncorrected state in this world.
Courtesy of http://www.youtube.com/watch?v=BYGCT4AQIR0