What does Ahab mean when he says Ahab never thinks he only feels feels feels that's tingling enough for mortal man to think's audacity?

This quote from Herman Melville's "Moby-Dick" suggests that Captain Ahab acts impulsively based on his intense emotions, rather than on logical reasoning. He believes that his feelings are strong enough to give him the courage and boldness to pursue his obsessive quest for revenge against the whale Moby Dick. Ahab sees his emotions as more powerful and trustworthy than his rational thoughts.