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I think it means if we wish to shut the door on our past then we haven't dealt with it, it is no good trying to block out the memories because then "out of the blue some long forgotten (bad) memory pops up and bites me in the butt."
If we deal with the past by doing steps 4 and 5 and then making amends (after all the sentence comes after step 9 in the book) where necessary then we can come to terms with the past and move on.
__________________  . As from a fire aflame thousands of sparks come forth,
even so from the Creator an infinity of beings have life and to him return again.
-- Maitri Upanishads |