Why Preach if God has Chosen His People? (Romans 10:14-15 (COD Head 1 Article 3; LD 6)

One of the great struggles that people have with the Reformed faith is the notion that if God chooses His people then why preach or send missionaries?  We can understand the force of this because if God has determined what has happened then why do anything?  It would seem that we are merely helpless pawns in the game of life.  Is this fair?  Is this really what Reformed people believe about preaching?