Classic Poem

" You are sick, that's sure" — they say:
" Sick of what?" — they disagree.
" 'Tis the brain" — thinks Doctor A;
" 'Tis the heart" — holds Doctor B;
" The liver — my life I'd lay!"
" The lungs!" " The lights!"
Ah me!
So ignorant of man's whole
Of bodily organs plain to see —
So sage and certain, frank and free,
About what's under lock and key —