One thing has to be remembered, that the past is no more, and clinging to the past is clinging to the dead. It is very dangerous, because it hampers and hinders your life, in the present and for the future. One should always go on freeing himself of the dead past. That is one of the fundamentals of sannyas, to go on renewing yourself every moment, to die to the past and be born anew. That which is gone is gone - don't even look back. Looking back is not a good sign.