How was the theme of the lust for power seen in 'Macbeth'?

In the play 'Macbeth' the theme of the lust for power was seen in the settings, and in the character of Macbeth. Lust refers to brutal desire without the veneer of idealism or spirituality. It therefore could be seen in the violent, crazed, bloody battle scenes in Act 1. It also could be seen in the senseless murders of a respected King, a loyal friend, and an innocent family. And it could be seen in the wretchedness of the entire Scottish nation.