Reality creators who've refined their concentration skills find many ways to apply but you don't hear much about "The past doesn't exist". At one time or another most of us have used the metaphors "digging up bones", "let sleeping dogs lie" etc but still miss the point because egoic mind is too busy using a imagined past created on the fly to justify the present. Join the Advanced creators who decide what they see is Real and escape the Matrix/nightmare/dream.