There is no doubt that Macbeth is a brave soldier when he fought against enemies. But he has many obvious disadvantages. He didn't know how to judge the characteristic of various people. He thinks the witches ''have more in them than mortal knowledge."(Act 1 Sense 5, 2-3) He is really easily to accept others' persuasion and inspire his greed by blandishment. Macbeth's initial mind is greed, but the greed was tightly limited by his loyalty to Duncan firstly. Before he decide to usurp, he really hesitate because he is satisfied with the throne of Cawdor and concerned about his conscience. But there are his wife and witches utilize his irresolution, unlock his greed and to push him to corrupt.