Why Preach if Elect Anyway? (1 Peter 1:23-25 (COD Heads 3/4 Art. 17)

I believe that God has chosen His people before the foundations of the world.  This is something that is rather risky for a preacher to believe because if God chooses His people then what is the point of preaching?  I mean really, if God just does what God desires then why preach?  Why care about the people who do not know the Lord? So, why do we preach if God chooses HIs people anyway?