"What I’ve dared, I’ve willed; and what I’ve willed, I’ll do! They think me mad – Starbuck does; but I’m demoniac, I am madness maddened! That wild madness that’s only calm to comprehend itself! The prophecy was that I should be dismembered; and – Aye! I lost this leg. I now prophesy that I will dismember my dismemberer."

... I prophesy a new work upon the waves, one built of wild madness 

:)