In act I, scene III, of Macbeth, the witches address Macbeth as Thane of Glamis. When they foretell that Macbeth will become Thane of Cawdor and king, he is bewildered. Soon after, a soldier informs him that Macbeth is now the Thane of Cawdor. Macbeth wonders to himself whether all the prophecies will come true.

Which lines in the excerpt show that Macbeth is on the verge of giving in to temptation, knowing very well that he is considering committing a terrible crime?