"Focus on this one thing: forgetting the past and looking forward to what lies ahead, I press on to reach the end of the age and receive the heavenly prize for which God, through Jesus Christ, is calling us." -Philippians 3:13-14
Paul isn't saying that we should forget what we have learned, but that we need to let go of what is holding us back from a relationship with Jesus. Let go of whatever it may be and focus on God as if you were running a race!!
Sometimes I think Paul was as fascinated with sports as Pastor Clay!!