Ambition is really not a quality that motivates Macduff; he seems quite satisfied with the role and responsibilities that he has, and we really do not see any evidence that he wishes for more. On the morning after Duncan's murder, Macduff arrives to awaken the king, saying,
I'll make so bold to call,
For 'tis my limited service. (2.3.57-58)
He is ready to perform is appointed duty. He does not try to do extra, as though in hopes that Duncan would bestow some new title or rights to him. He does his duty, proudly and without complaint: nothing more and nothing less. When Macduff discovers that Duncan is dead, he never stops to consider how the king's death might benefit him or leave a gap that he might fill. Instead, in the moments following his discovery, he claims that the scene with Duncan's body would "destroy" the observer's sight "With a new Gorgon" and sounds the alarm to...
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