Since some Mudcatters may not have memorized the latter pages of Moby-Dick, here are the pertinent passages:

From Chapter 135:
"Heart of wrought steel!" murmured Starbuck gazing over the side, and following with his eyes the receding boat- "canst thou yet ring boldly to that sight?- lowering thy keel among ravening sharks, and followed by them, open-mouthed to the chase; and this the critical third day?- For when three days flow together in one continuous intense pursuit; be sure the first is the morning, the second the noon, and the third the evening and the end of that thing- be that end what it may. Oh! my God! what is this that shoots through me, and leaves me so deadly calm, yet expectant,- fixed at the top of a shudder! Future things swim before me, as in empty outlines and skeletons; all the past is somehow grown dim. Mary, girl; thou fadest in pale glories behind me; boy! I seem to see but thy eyes grown wondrous blue. Strangest problems of life seem clearing; but clouds sweep between- Is my journey's end coming? My legs feel faint; like his who has footed it all day. Feel thy heart,- beat it yet? Stir thyself, Starbuck!- stave it off- move, move! speak aloud!- Mast-head there! See ye my boy's hand on the hill?- Crazed;- aloft there!- keep thy keenest eye upon the boats:- mark well the whale!- Ho! again!- drive off that hawk! see! he pecks- he tears the vane"- pointing to the red flag flying at the main-truck- "Ha, he soars away with it!- Where's the old man now? see'st thou that sight, oh Ahab!- shudder, shudder!"
[…]
Meantime, for that one beholding instant, Tashtego's mast-head hammer remained suspended in his hand; and the red flag, half-wrapping him as with a plaid, then streamed itself straight out from him, as his own forward-flowing heart; while Starbuck and Stubb, standing upon the bowsprit beneath, caught sight of the down-coming monster just as soon as he.

As an aside, I mention the following bit of dialogue from the 1956 movie version with Gregory Peck:

Starbuck, first mate: It is our task in life to kill whales, to furnish oil for the lamps of the world. If we perform that task well and faithfully, we do a service to mankind that pleases Almighty God. Ahab would deny all that. He has taken us from the rich harvest we were reaping to satisfy his lust for vengeance. He is twisting that which is holy into something dark and purposeless. He is a Champion of Darkness. Ahab's red flag challenges the heavens.
Stubb: Well, sir, if it's like that, I don't wonder that you, a religious man, might be a bit downcast. But I don't much see what you can do about it.
Starbuck, first mate: Listen to this.
[He goes over to a bookshelf, picks up a heavy book, opens it, and reads aloud from it]
Starbuck, first mate: "A captain who, from private motives, employs his vessel for another purpose from that intended by the owners, is answerable to the charge of usurpation, and his crew is morally and legally entitled to employ forceful means in wresting his command from him.

Haruo