With his surcease success; that but this blow
Might be the be-all and the end-all here,
But here, upon this bank and shoal of time,
We'ld jump the life to come. But in these cases
We still have judgement here; that we but teach
Bloody instructions, which, being taught, return
To plague the inventor: this even-handed justice
Commends the ingredients of our poisoned chalice
To our own lips.
So far he has reached no higher consideration, in reference to treason and murder, than the fear that he may be suggesting to others to use against himself the weapon he is intending for Duncan. Then his thoughts turn to the motives against crime which belong to the softer side of our nature.