William Shakespeare's Macbeth revolves around the downfall of several key characters during the course of this tragic play. Security or overconfidence is a feeling of freedom from danger, care, or fear. When one feels invincible, they may lose all rational thought in their heads as well as in their hearts. By the end of the play, overconfidence can be linked to the downfall of three important characters in the play: Duncan, Banquo and Macbeth.

Duncan was killed mainly because of his poor judgment of a person, namely Macbeth. We see from the first act that Duncan has trusted two people, Thane of Cawdor and Macdonwald, who would betray him and Scotland. This shows he has a record for establishing trust with the wrong people. Duncan believes, "There's no art to find the mind's construction in the face: he was a man whom I built an...