Psalm 19 is known as a psalm of ascents, a poem sung as worshipers ascended up towards the Temple Mount in Jerusalem during various annual festivals.It is about praising God for both his creation and the law, and then finishes with powerful confession and heart commitments.
Psalms 19:12-13 ESV Who can discern his errors? Declare me innocent from hidden faults. Keep back your servant also from presumptuous sins; let them not have dominion over me! Then I shall be blameless, and innocent of great transgression. (emphasis mine)
The psalmist asks God to forgive him for two things, for his 'hidden faults' and his 'wilful sins'. In other words, for his blind spots where he commits sin without realizing it, and for the times when he commits sins knowingly. Both are sin, and both need confession, and the psalmist humbly asks for his blinders to be removed as God forgives him for his wrongdoings.
He then moves towards petition and commitment for what is ahead – he asks that the words from his mouth and the meditations from his heart would be pleasing to God.
Psalms 19:14 ESV Let the words of my mouth and the meditation of my heart be acceptable in your sight, O Lord , my rock and my redeemer.
He prays that everything external and internal within him would be acceptable to God.
We all have blind spots so we need to ask God to reveal them so that we can deal with them by asking the Holy Spirit to fill us.
Ephesians 5:15-21 ESV Look carefully then how you walk, not as unwise but as wise, making the best use of the time, because the days are evil. Therefore do not be foolish, but understand what the will of the Lord is. And do not get drunk with wine, for that is debauchery, but be filled with the Spirit, addressing one another in psalms and hymns and spiritual songs, singing and making melody to the Lord with your heart, giving thanks always and for everything to God the Father in the name of our Lord Jesus Christ, submitting to one another out of reverence for Christ.
Galatians 5:16-17, 22-23 ESV But I say, walk by the Spirit, and you will not gratify the desires of the flesh. For the desires of the flesh are against the Spirit, and the desires of the Spirit are against the flesh, for these are opposed to each other, to keep you from doing the things you want to do. But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness, self-control; against such things there is no law.
Take time today to quiet your heart before God and ask him to meet you in your 'hidden faults' and your 'willful sins'. If he leads you towards confession, do so. Then, out of a place of confession, commit your external and internal life to his service and glory.