"...with lovers, when they love each other with an equal ardor
and their mutual affection is intensely strong, they will turn against one another
without any valid reason, each purposely contradicting the other...
they quarrel violently over the smallest things..." 
ibn Hazm (994–1064 CE), Ṭawq al-Ḥamāmah (The Necklace of the Dove)
Translated by A.J. Arberry