Macbeth 3.1

Do you mean from act 3 sc.1?

Yes

To be thus is nothing, But to be safely thus.

Upon my head they placed a fruitless crown
And put a barren scepter in my grip,
Thence to be wrenched with an unlineal hand,
No son of mine succeeding. If ’t be so,
For Banquo’s issue have I filed my mind;
For them the gracious Duncan have I murdered;