What are some important quotions and its dramatic purpose from Act III scene 5 of Macbeth?this scene is really short....is there anything important...

This scene accomplishes two things.  In it we meet the
head of the witches, Hecate, and it also reinforces the witchcraft
idea.

Hecate it the boss, so to speak, and she is none too
happy with the three witches who have met with Macbeth.  She calls him a wayward son
and tells them they should not have told him anything.  "Spiteful and wrathful , who, as
others do,/Loves for his own end, not for you."

To get back
into her good graces, she instructs them on just what she wants them to do the next time
they meet with him.  They are to tell him and show him certain things which will lead
him to think that he cannot be beaten in the war he knows is coming.  This, of course,
sets up his over-confidence which leads to his
downfall.

The second half of the scene with the sprites
shows Hecate's power but it also plays into the Elizabethan audience's belief in
witchcraft.  Witches and demons were very real to Elizabethan England.  King James
himself had written about witchcraft.