Lyric discussion by WinterOnyx 

Cover art for Do What You Have To Do lyrics by Sarah McLachlan

Hmm. I think everyone here has touched on the meaning, but to me it's a little different. I feel like it's about her being so completely in love with someone that just isn't able to give her the same kind of love back. Whether it be because he doesn't feel the same, or because he isn't able to admit to that strong of a feeling. Perhaps she refers to him as a monster, because she can't believe he would be so cruel as to deny such a true love. She tries endlessly to do what he wants her to do, to leave it be, but she can't escape her own heart and the truth of the situation. The depth of the love shakes her to the core. Knowing that she won't be able to let this love go, scares her to death and leaves her burning in torment. At least this is what I percieve...perhaps I just know that torment all too well.