Philippians 3:13  

Brother and sisters, I do not consider that I have made it my own yet; but one thing I do: forgetting what lies behind and reaching forward to what lies ahead.  

Whether they are for the good times or bad times, our thoughts of the past can hinder us.  Why?  Because we are not focusing on what we need in the present.  Today needs attention so that we can have a positive influence for the good in our lives.  We can’t change the past or go back, but we can make today a step forward with God.