The reason the theme is important to understanding the narrative of the book is Macbeth demonstrates several situations where evil turns good and same in reverse. The theme Fair is Foul, Foul is Fair shows itself in the very beginning with Macbeth and Banquo encountering the witches and progresses. After Banquo was murdered the earth was under destruction, disastrous even. This is caused by the unnatural death of Banquo:
“Our chimneys were blown down, and, as they say, Lamentings heard i’th’air, strange screams of death And prophesying with accents terrible Of dire combustion and confus’d events, New hatch’d to th’woeful time. The obscure bird Clamour’d the livelong night. Some say, the earth
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This is quoted and said by the second witch by this she means that Macbeth is coming she calls Macbeth wicked. He shows us he has two sides he was an ambitious warrior, one of the many leaders of Duncan's army. However later on with the assistants of Lady Macbeth's twisted mind, Macbeth kills Banquo.
Here's a line from the play: “O, treachery!/Fly, good Fleance, fly, fly, fly!/“ Thou mayst revenge---O slave! (III,iii, 19-21)
This was Banquo saying they will seek revenge. Also to fly which means to escape. He also stated “O, treachery“ which means that Macbeth betrayed him so he could be next in line for king.
From my research I have found a website that went into depth of the theme Fair is Foul, and Foul is Fair (FFFF). “The meaning of this motif is quite obvious in the very first act. Simply it means that appearances are often deceptive, and that things are different from what they appear to be. This line also points towards the play’s concern with the inconsistency between appearance and reality.“