Which lines in this excerpt from macbeth act i, scene 5, show that lady macbeth doubts macbeth’s willpower?

Glamis thou art, and Cawdor; and shalt be

What thou art promis'd; yet do I fear thy nature;

It is too full o' the milk of human kindness

To catch the nearest way: thou wouldst be great;

Art not without ambition; but without

The illness should attend it. What thou wouldst highly,

That wouldst thou holily; wouldst not play false,

And yet wouldst wrongly win:

Explanation:

In photo below

the complete subject is

lorna

a low four-wheeled open carriage of a kind formerly used in russia.