The Psalmist Comes To His Senses and Acknowledges His Sin Thus Finding Forgiveness (5).
‘I acknowledged my sin to you,
And my iniquity I did not hide,
I said, I will confess my transgressions to YHWH,
And YOU (emphatic) forgave the iniquity of my sin.' Selah.
Coming at last to his senses David acknowledged his sin to God, and did not hide anything from Him. In other words He began again to ‘walk in the light' (1 John 1:7). He was totally open with God. And once he had genuinely said, ‘I will confess my transgressions to YHWH', he was conscious that God had forgiven Him his sins. ‘If we walk in the light as He is in the light -- the blood of Jesus Christ, God's Son, cleanses us from all sin' (1 John 1:7).
The verb for ‘hide' is the same as for ‘cover' in Psalms 32:1. It guarantees that if I uncover my sins to God, then He will step in and cover them so that they are remembered no more for ever. The words for transgression, iniquity and sin are also as in Psalms 32:1-2.
It has been suggested that the Psalm is lacking because there is no reference to the grace of God, but David was undoubtedly conscious of the fact that for the kind of sins that he had committed his only hope lay in the grace of God. Strictly they warranted immediate judgment. And what he is therefore expressing here is the wonder of God's grace, freely given on his coming to Him. He was relying totally on the mercy and active compassion of God.