ADVANTAGES

The / scansion at the beginning of this line is based on the phrasing and syntax. "Not so" pronounced with equal weight makes more sense than just punching the "not" in the phrase. The is important because the statement "there's no such thing" is the turning point in the speech. Macbeth, who has seen the dagger and spent the first 14½ lines of this soliloquy waxing eloquent about its portent, takes a deep breath—and abruptly dismisses the vision in four terse syllables. It's my contention that this is when Macbeth finally resolves to kill Duncan. Whether or not he's bucking himself up with false courage is a moot point. Macbeth takes in the sight of blood appearing on the dagger and decides that he's seen enough.

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