After an error you need not only to remove the causes but also to correct the error itself: after a sin you must not only, if possible, remove the temptation, you must also go back and repent the sin itself. In each case an 'undoing' is required.
C. S. LewisHe that but looketh on a plate of ham and eggs to lust after it hath already committed breakfast with it in his heart
C. S. Lewis