Why does Macbeth seek the witches again in Act 3? 

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To answer this question, take a look at the conversation between Macbeth and Lady Macbeth in act III, scene IV. Pay particular attention to the following lines:

For now I am bent to know,
By the worst means, the worst. For mine own good,
All causes shall give way.

In other words, Macbeth is desperate to know what will happen in the future. Clearly, he is feeling insecure about his reign. Specifically, he is worried about Macduff and why he did not attend the banquet. He has also just seen the ghost of Banquo, so perhaps feels that Banquo's sons still pose a threat to him.

The fact that Macbeth seeks the witches shows just how much he trusts them. He believes wholeheartedly that they can give him the answers that he seeks. As Macbeth says in this quote, he wants to know his future. He does not care if the future looks good or bad—he just wants the chance to prepare himself accordingly.

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In Act Three, Scene 4, Macbeth sees the ghost of Banquo in the middle of a feast. Macbeth is startled and begins to speak to the ghost. After the feast is over, Macbeth has a conversation with his wife about the hallucination then informs her that he has a paid spy in each of the noblemen's homes. He then tells Lady Macbeth that he will go visit the three witches tomorrow because he wants to know more about his future. Macbeth is especially concerned about his safety and wants the witches to give him further information about what is next to come. In Act Four, Scene 1, Macbeth visits the three witches who summon three spirits that reveal the future. The first apparition tells Macbeth to beware of Macduff, the second spirit tells him to laugh at the power of other men because nobody born of a woman can harm him, and the third apparition says that he will not be defeated until Birnam Wood marches towards Dunsinane Hill. 

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