Proverbs 4:23 also says to "Keep thy heart with all diligence; for out of it are all the issues of life."  This says "above all else" - we are to guard our hearts.  We are to keep our hearts free from the hurts and fears of the past and to keep emotional turmoil out.  This is a necessity because the last part of the verse states that all the issues of our lives come out of our hearts.

This means that I live this very day in either a good or bad way depending on the dictates of my heart.  This also means that I need to allow inner healing to touch my heart and emotions.  I can be released from the imprints of the past.  The Holy Spirit's healing will allow me to forget the past and to move forward in confidence.