If it were done when tis done, then twere well It were done quickly: If the assassination Could trammel up the consequence, and catch, 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, Wed jump the life to come.But in these cases, We still have judgment here; that we but teach Bloody instructions, which, being taught, return To plague the inventor: This even-handed justice Commends the ingredients of our poisond chalice To our own lips.Hes 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 murtherer shut the door, Not bear the knife myself. Shakespeare.Macbeth, Act I. Scene 7. (Solus.)