The whole story Macbeth is based on Good versus Evil.

Macbeth was a very Good general who loved and was loved by the king. But after discovering the prophesy he became ambitious and killed the king, so became more Evil.
Then, as the story goes by, he killed his best friend Banquo and Macduff's familly, which lead to a rebellion against the Evil king.
Also, Macbeth was seeing ghosts and was dealing with Witches, which proved he was pur Evil at the end of the story.
Luckily, Malcom and Macduff won over Macbeth and they were Good, so the world, terrified by Macbeth's reign, turned a lot more peaceful then before.