We tell Satan to leave us alone by being obedient to God. Jesus said to the devil in Matthew 4:10, "Away from me, Satan! For it is written: Worship the Lord your God, and serve him only."
This is where having the right heart comes in to play again. To serve like Jesus served should be our goal. When we have reached this level of maturity then our hearts and minds will be in the right place. Life may not be easier, but how to handle it will.