Edmund Burke,
On the Sublime and Beautiful — Chapter 8
“ When men have suffered their imaginations to be long affected with any idea, it so wholly engrosses them as to shut out by degrees almost every other, and to break down every partition of the mind which would confine it. Any idea is sufficient for the purpose, as is evident from the infinite variety of causes, which give rise to madness: but this at most can only prove, that the passion of love is capable of producing very extraordinary effects, not that its extraordinary emotions have any connexion with positive pain. ”
