Here's an example of what I was referring to yesterday (i.e. the importance of building meaning line by line when reading Shakespeare). It comes from act one, scene five of Macbeth, shortly after we first meet Lady Macbeth. The scene opens with her reading the letter from Macbeth which informs her of the prophecies made by the weird sisters. She is delighted by the news, but is simultaneously worried that Macbeth's nature, "too full o' the milk of human kindness", will not allow him to seize the opportunity presented. She then resolves to bring him to it, perhaps more quickly than she has imagined, because immediately, a messenger enters with important news:

LADY MACBETH

What is your tidings?

MESSENGER

The king comes here to-night.

LADY MACBETH

Thou'rt mad to say it:

Is not thy master with him? who, were't so,

Would have inform'd for preparation.

MESSENGER

So please you, it is true: our thane is coming:

One of my fellows had the speed of him,

Who, almost dead for breath, had scarcely more

Than would make up his message.

LADY MACBETH

Give him tending;

He brings great news.

[Exit Messenger]

The raven himself is hoarse

That croaks the fatal entrance of Duncan

Under my battlements.

The final sentence of this excerpt is the really famous one, but unless we read line by line, building each new idea, image or piece of information carefully on what came before, we won't see that the "raven" referred to is, in fact, the colleague of the messenger in the scene, who rode so fast that he was "almost dead for breath", with "scarcely more/ Than would make up his message".