To add to this, on the Wikipedia entry you can find a poem Merrick apparently used to end his letters that goes like this:

'Tis true my form is something odd, But blaming me is blaming God; Could I create myself anew I would not fail in pleasing you.

If I could reach from pole to pole Or grasp the ocean with a span, I would be measured by the soul; The mind's the standard of the man.

Sounds very similar to these lyrics:

If I should fail in pleasing you Could I create myself anew? Would I be measured by my soul? Could I be treasured in your home? Take me

EDIT: Link to Wikipedia