All of us are looking for a kingdom, not a stereotypical kingdom with a castle and a mote, but we want to set our lives up to be safe, prosperous, and secure.  The people of the first century were likewise tempted to build a life of security and safety for themselves but because they had chosen to follow Jesus their lives had become less secure. So the preacher, knowing their fears and insecurities, calls to them with the glories of the kingdom of Jesus to assure them of where they stand because of Him.