By thy cold breast and serpent smile,
By thy unfathom'd gulfs of guile,
By that most seeming virtuous eye,
By thy shut soul's hypocrisy;
By the perfection of thine art
Which pass'd for human thine own heart;
By thy delight in others' pain,
And by thy brotherhood of Cain,
I call upon thee! and compel
Thyself to be thy proper Hell!

Act I, scene i - Manfred (1817)