The Kingdom of God.  It requires attention and concentration over the long haul.  According to Jesus, if you and I expect to be a part of God’s Kingdom, now and forever, we must be serious about our work.  We can’t wander.  We can’t look back.  Once we start, if we aren’t committed, we’re in trouble.  No matter how hard it may be; no matter what may come along to distract us; we have to press on with the task at hand.  “No one who puts a hand to the plow and looks back is fit for the kingdom of God.”