My heart was not always found writhing in such torment; what can I even say about its beginning and its ultimate end?

Here, the poet looks back with a quiet sigh at the tragic transformation of his own heart. There was once a peaceful time when it was serene and untroubled, but love has reduced it to a state of ceaseless torment. By contrasting its gentle beginning with its agonizing end, he captures the heartbreak of realizing just how utterly passion can ruin one's peace.