Cite 2 comments Macbeth makes in his soliloquy that are reasons why he should not kI'll king Duncan

There are quite a few reasons that Macbeth states in this quote:

We still have judgment here, that we but teach
Bloody instructions, which, being taught, return
To plague th' inventor: this even-handed justice
Commends the ingredients of our poisoned chalice
To our own lips. He’s here in double trust:
First, as I am his kinsman and his subject,
Strong both against the deed; then, as his host,
Who should against his murderer shut the door,
Not bear the knife myself.