Kill that which you love - Often, ambition

 Often, ambition

When I am reminded of the things I've lost, I realize that I had no control over losing them because I would not lose the other things which I loved. Had I simply thrown them from my breast, my would would have turned out a prettier place. 

Success demands sacrifice. 

Lady MacBeth was evil, but there is a kernel of truth in her statement: 

 I would, while it was smiling in my face, Have plucked my nipple from his boneless gums. And dashed the brains out, had I so sworn. As you have done to this.