What evidence from the text supports the idea that macbeth has decided to stop being indecisive and will take action?

This dust was once the manthis dust was once the man, gentle, plain, just and resolute, under whose cautious hand, against the foulest crime in history known in any land or age, was saved the union of these states walt whitman who is "the man" the dust now represents? the narrator a criminal whitman lincoln