Prayer Changes Everything!

I ever read somewhere in the Bible... God says"if u have a pure heart, watever u ask in Jesus name, He will grant u watever ur heart desires" REally koollllllllll.. Readers, just to share with u,, so far , God has never failed me in any of my prayers though i do not have a pure heart. i have a very bad temper in me.....i wish to eradicate that ill temper in me .. smile... i know that only God can change me ...........smileeeeee