For all these sun and earth and sky and sea are one with the parts of themselves that have been separated from them and born in mortal things. In the same way, those that are more ready to combine are made similar by Aphrodite and feel mutual affection. But such as are most different from each other in birth and mixture and in the moulding of their forms are most hostile, quite inexperienced in union, and grieving deeply at their generation in strife, in that they were born in anger.

Fragments, On Nature. Translated by M. R. Wright