Macbeth is set in a society in which the notion of honor to one's word and loyalty to one's superiors is absolute. At the top of this hierarchy is the king, God's representative on Earth. Other relationships also depend on loyalty: comradeship in warfare, hospitality of host towards guest, and the loyalty between husband and wife. In this play, all these basic societal relationships are perverted or broken. Lady Macbeth's domination over her husband, Macbeth's treacherous act of regicide, and his destruction of comradely and family bonds, all go against the natural order of things.
The medieval and renaissance view of the world saw a relationship between order on earth, the so-called microcosm, and order on the larger scale of the universe, or macrocosm. Thus, when Lennox and the Old Man talk of the terrifying alteration in the natural order of the universe — tempests, earthquakes, darkness at noon, and so on — these are all reflections of the breakage of the natural order that Macbeth has brought about in his own microcosmic world.
