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."
Another part of the story, Malcolm and Donalbain realize that Macbeth is very greedy while living luxuriously.
In ACT 4 SCENE 3, Malcolm states how greedy Macbeth is. 
"I grant him bloody,
Luxurious, avaricious, false, deceitful, 
Sudden, malicious, smacking of every sin 
That has a name."

"That day will never come. Greet the king with a welcoming expression, in your eyes and hands, you should look like an innocent flower, but be like the snake that hides underneath"

In the quote lady Macbeth is controlling Macbeth and telling him to act normal and innocent do the king won't be suspicious on the night king Duncan comes to visit.

'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.' (1.4.55-60)

Wherein you dressed yourself? Hath it slept since?

And wakes it now, to look so green and pale

At what it did so freely? From this time

Such I account thy love. Art thou afeard

To be the same in thine own act and valor

As thou art in desire? Wouldst thou have that

Which thou esteem’st the ornament of life,

And live a coward in thine own esteem,

Letting “I dare not” wait upon “I would, ”

Like the poor cat i' th' adage"

This quote was from the scene where lasy Macbeth was convincing Macbeth to continue with the plan. Macbett

Lady Macbeth is very evil because of her bad intentions of killing king Duncan.

In the whole act 1, lady Macbeth and Macbeth were planning king Duncan's death so that they can take over the throne and get all the money and power

This is a quote said by lady Macbeth that proves she's evil:

"Come, you spirits That tend on mortal thoughts, unsex me here,     And fill me from the crown to the toe top-full     Of direst cruelty! make thick my blood;     Stop up the access and passage to remorse,     That no compunctious visitings of nature Shake my fell purpose, nor keep peace between The effect and it!"

(Act 1 scene 5)

That made you break this enterprise to me?

When you durst do it, then you were a man;

50

And to be more than what you were, you would

Be so much more the man. Nor time nor place

Did then adhere, and yet you would make both.