Read the excerpt. Malcolm urges Macduff to make his grief "the whetstone of [his] sword.” Why is this metaphor most likely to be persuasive?

A whetstone sharpens a blade, so Malcolm is urging Macduff to turn his grief into strength and determination. Because Macbeth caused Macduff’s loss, that grief gives Macduff an additional personal reason to fight and defeat him. The metaphor is not mainly about choosing a strategy or worrying about their chances.

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