Macbeth's motivation is power and status. Initially, his motivation is sparked by the weird sisters, who suggest to him that he is "fated" to have the crown. The weird sisters would have been seen as suspicious by an Elizabethan audience, hence unhealthy. They are other-worldly, and not the kind of spiritual beings who should be trusted.
Macbeth's wife also has some rather unhealthy means to motivate him. She berates him by calling him a coward, questions his manhood, and then drives the nail home by saying that he can't possibly love her if he can break a promise to her so easily.
He says himself that he has no reason to kill Duncan but pride and ambition.
As for the other killings that follow the killing of the king, they are all done to ease his paranoia and to keep him in power. He finds that once he has power, he can't rest in it, but has to keep killing to hold on to it.
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