In the play Macbeth,what ideas does Shakespeare develop regarding dilemmas?

The play Macbeth is wrought with
dilemmas and these cause characters to have serious internal conflicts.  For example,
early in the play, Macbeth is faced with the dilemma over whether or not to kill King
Duncan.  On one hand, he really wants to be king and have the witches' prediction come
true, but he realizes that Malcolm has just been named Prince of Cumberland and is
therefore the heir to the throne.  He does not see how he can become king if Malcolm is
in the way.  Macbeth's dilemma is further complicated when he reveals his problems to
Lady Macbeth--she wants him to be less cowardly and go after his ambitions so she chides
his manhood and tells him that he would be more of a man if he were to kill the king to
take his title.  Macbeth's dilemma then questions his moral character:  does he follow
his ambition or does he respect Duncan's life and rule?  Shakespeare couches Macbeth's
dilemma in the tension between fate and free will--should Macbeth allow fate to control
his life or should he act to get what he wants?