“Moreover by the law,
Your servant is warned.
In keeping the law,
There is a great reward.
But who can discern his errors?
Clear me from hidden faults!
Keep back your servant also from the insolent!
Do not let them have dominion over me!
Then I shall be blameless.
I shall be innocent of a great transgression.”
This then is prayer to follow the law of Yahweh. There is a reward for following the law of Yahweh. How can anyone discern their errors? How can they be clear from hidden faults? They have to stay away from the insolent ones. David does not want to let them have power over him. He wants to be blameless and innocent. Without the help of Yahweh it is not possible to follow the law.