Which lines in this excerpt from act III of Shakespeare's Macbeth refer to Macbeth's insecurity because of the threats to his kingship? LADY MACBETH: -[Naught's had, all's spent, Where our desire is got without content: Tis safer to be that which we destroy, Than, by destruction, dwell in doubtful joy.]-

(Enter Macbeth)

How now, my lord! why do you keep alone, of sorriest fancies your companions making: Using those thoughts which should indeed have died With them they think on? Things without all remedy Should be without regard: what's done
is done.

MACBETH: -[We have scotch'd the snake, not kill'd ir She'll close, and be herself; whilst our poor malice Remains in danger of her former tooth.]-

But let the frame of things disjoint, Both the worlds suffer, Ere we will eat our meal in fear, and sleep In the affliction of these terrible dreams.

-[That shake us nightly better be with the dead, Whom we, to gain our peace, have sent to peace, Than on the torture of the mind to lie]-

In restless ecstasy. Duncan is in his grave, After life's fitful fever he sleeps well;

-[Treason has done his worst: nor steel, nor poison, Malice domestic, foreign levy, nothing, Can touch him further.]-

choices are in brackets