柏拉图老爷爷说：从前的人类是雌雄同体的，正如有的朋友怀疑仔仔小姐和我一样。
这些雌雄同体的人冒犯了神，神决定把人劈成两半。从此以后，人类的本能之一也是
使命之一就是寻找被分开的另外一半，并与之融合，再不分离。

Toward the Undivided
According to Plato, humans descended from a primordial race "whose essence is
now extinct" - a race of hermaphrodites. The race was powerful, yet arrogant,
and when they rebelled against the Gods, they were in turn cursed and split in
two. According to Plato, "From such an ancient time love has goaded human beings,
one toward another; it is inborn, and seeks to renew our ancient nature in an
endeavor to unite in one single being two distinct beings, and therefore, to
restore human nature to good health." He added that , "... this was indeed our
primitive nature when we constituted one unit which was still whole; it is really
the burning longing for this unity which bears the name of love." This is echoed
in Genesis 2:24, which says, "For this reason a man will leave his father and
mother to be united with his wife, and they will become one flesh (emphasis added.)"