what are quotes throughout the play that show it was macbeth himself that's solely responsible for his downfall

I can give you a few:

My thought, whose murder yet is but fantastical,
Shakes so my single state of man
That function is smother'd in surmise,
and nothing is but what is not. act 1 sc 3

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. act 1 sc 4

I have no spur
To prick the sides of my intent, but only
Vaulting ambition, which o'erleaps itself
And falls on the other—Act 1 sc 7