Burdens

It is never God's plan for us to have unnecessary burdens on our hearts. He stresses the concept of forgiving and forgetting so much, how can we linger on things that are of the past. God is not interested in what was already been forgiven, all he wants us to concentrate on is the here and now. We might wake up one day and everything might be totally different. Do we really want to spend the last of our days sulking instead of doing God's work?