What ideas of evil do we gain from the witches, lady macbeth and macbeth?

Shakespeare in his play "Macbeth" has worked on the issue of evil that any person irrespective of gender, class or position may undergo through. It's under the influence of that evil that any virtuous or kind person too starts to conspire and then become a wicked person. The introducing scene of the play itself reflects the presence of 'evilness' throughout the journey of the life of Macbeth. The three Witches who told the future of Macbeth while his return from the war attracted him to at least think once about attaining the throne by any means. Soon after meeting his wife, Lady Macbeth, who is considered as the fourth witch, Macbeth's inclination towards the attainment of the throne saw its progress. At times he wanted to step back from committing the murder but the announcement of the three withes and the planning of his wife made him move forward. Macbeth's evilness saw its rise when it was evoked by these circumstances. The nature of evil both in the play and in real life have the same influence over people. They possess the power to manipulate and influence any person as per them.