‘Who can discern his errors?
Clear me from hidden faults.'
But the Psalmist admits that although he delights in Yahweh's Instruction there are still errors and sins in his life that he is not easily aware of. For he is so sinful that even God's Instruction cannot cover all his sins. So he prays that he may be cleansed from what is hidden, his faults of which he is not aware. He wants God to put him in the right before Him because he himself, as far as he is able, looks to Him and lives according to His word.