Changing God's Mind

On day 38, David changes Gods mind, by praying that he be merciful on Jerusalem.  Moses and Abraham also prayed and God changed his mind.  So we must all be able to, through prayer,  change God's mind.  Perhaps, this is a call for me to engage him in relationship more deeply.  Perhaps he is asking me to come to a place in our relationship where we can communicate enough that I can in fact, change his mind.  Maybe in turn, I will change my own mind about my misconceptions of him.