When we fall in love we are falling into a stream of naturally occurring amphetamines running through the emotional centers of our very own brains. That is why we feel exhilarated, manic, powerful, creative, suddenly grown up if we are young and suddenly rejuvenated if we are older. The ecstasy of love is located in our nerves; we get high; we speed. Eventually, our nerves being what they are, their endings become amphetamine immune or exhausted, and the delirium of our free fall abates. We come down to earth.
-Elisabeth Young-Bruehl, “Where Do We Fall When We Fall in Love?” Journal for the Psychoanalysis of Culture and Society 8 (Fall 2003): 279 (emphasis added).