Alas! it was very late in life, and cruel was it to consume with a passion not less violent than unfortunate for a woman whose heart was already in the possession of another.
 Jean-Jacques Rousseau, Confessions (1782). copy citation

add
Author Jean-Jacques Rousseau
Source Confessions
Topic passion women
Date 1782
Language English
Reference
Note Translated by Samuel William Orson
Weblink https://en.wikisource.org/wiki/Confessions_(Rousseau)

Context

“She spoke, and I felt myself affected; I thought I was nothing more than interested in her sentiments, when I perceived I possessed those which were similar; I drank freely of the poisoned cup, of which I yet tasted nothing more than the sweetness. Finally, imperceptibly to us both, she inspired me for herself with all she expressed for her lover. Alas! it was very late in life, and cruel was it to consume with a passion not less violent than unfortunate for a woman whose heart was already in the possession of another. Notwithstanding the extraordinary emotions I had felt when near to her, I did not at first perceive what had happened to me; it was not until after her departure that, wishing to think of Julia, I was struck with surprise at being unable to think of anything but Madam d' Houdetot.” source