Act 1, Scene 7, Line 1-2 - Macbeth -"If it were done when ’tis done, then ’twere well It were done quickly"

In this quote, to begin with Macbeth is already uncertain about murdering the King. Macbeth was scared and weak minded about the whole situation, Lady Macbeth gets aggravated with his disability to concentrate and be confident about what he has to do. Therefore Macbeth wants to get the killing over as quickly as he can, and just be done with it. He did not want anyone to know so he was very cautious on he went about the murder of King Duncan.