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The quote shows a decrease in his mental state as he goes from being innocent to guilty with similes. It also points out, once again, that he is afraid of what's to come and what he's done.
Hen comes my fit again: I had else been perfect, /Whole as the marble, founded as the rock, /As broad and general as the casing air /But now I am cabin'd, cribb'd, confined, bound in /To saucy doubts and fears.