Read this passage: MACBETH, aside. The Prince of Cumberland! that is a step
On which I must fall down, or else o'erleap.
For in my way it lies. Stars, hide your fires;
Let not light see my black and deep desires:
The
eye wink at the hand; yet let that be,
Which the eye fears, when it is done, to see.
-William Shakespeare, Macbeth, Act I, scene iv

What future event does this passage foreshadow?