Read the excerpt from act 4, scene 3 of The Tragedy of Macbeth. Malcolm is speaking with Macduff about the slaying of his family.

Malcolm. Be this the whetstone of your sword: let grief
Convert to anger; blunt not the heart, enrage it.

What does Malcolm mean in these lines?

He urges Macduff to turn his desolation into rage.
He explains that Macduff needs to prepare his sword for battle.
He attempts to change the way Macduff deals with his enemies.
He suggests that Macduff try to ignore his emotions.