The first story about division comes from ancient Persia: the god of time, having created the universe, sees harmony all around him, but feels that there is still something very important missing - a companion with whom to share all this beauty.
.... For a thousand years, he prays for a son. The story does not say to whom he prays, given that he is omnipotent, he becomes pregnant.
.... When he realises he has achieved his heart's desire, the god of time is filled with remorse, suddenly conscious of how fragile the balance of things is. But, it is too late and the child is already on it's way. All he achieves by his lamentations is to cause the son he is carrying in his belly to divide into two.
.... The legend recounts that just as Good (Ormuzd) is born out of the god of time's prayers, so Evil (Ahriman) is born out of remorse - twin brothers.
.... The concerned father arranges everything so that Ormuzd will emerge first from the belly, take charge of his brother and to prevent Ahriman from throwing the universe into confusion. However, Evil - being very intelligent and resourceful - manages to push Ormuzd aside at the moment of birth, and thus is the first to see the light of the stars.
.... Distraught, the god of time resolves to forge alliances on Ormuzd's behalf: he brings into being the human race so that they can fight alongside Ormuzd and stop Ahriman taking control of everything.
.... In the Persian legend, the human race is born to be the ally of Good, and, according tradition, Good will triumph in the end. However, many centuries later, another story about division emerges, this time presenting the opposite view: man as instrument of Evil.

I imagine that most people will know which story I mean. A man and a woman in the Garden of Eden....