The Sonnet use rhyme scheme of abab, cdcd, efef,gg. It is believed Shakespeare addressed this sonnet to a younger lover. I believe the theme is We love something we know is going to be gone soon more than we love it in it's peak. It's the perceptive of someone that love something that he's sure gonna be eventually gone/ taken away form him.
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He objects to Ahab’s pursuit of a creature that is too cunning. Captain Ahab intends to save Starbuck while they are sailing on the seas. During their trip the boats are attacked by Mobydick. This is the reason why Captain Ahab objects to Starbuck's desire and he forgets about his promise.
Im thinking it is a prefix. i may be wrong though