Bible Commentary
Psalm 131
Psalm 131 is the third of four psalms of David among the songs of ascents. As the third song of ascents in the fourth set of three, we would expect its theme to be blessing and peace in Zion--and this does fit with the mention of David, the king in Jerusalem, having a calmed and quieted soul and of Israel living in the hope of God forever (verses 2-3). The same exhortation for Israel to hope in God in Psalms 130:7 and Psalm 131:3 serves to link these two psalms thematically--as does proximity and the continued mood of humility before God.
In light of his accomplishments, David could have been proud. Yet he presents himself to the Lord as a humble man. At heart he is not arrogant or filled with self-importance, nor does he have aspirations for personal greatness (verse 1). He does not deem himself more capable than he is, recognizing his limitations (same verse).
He is at peace and content in God's presence, like a weaned child who no longer frets and cries for milk from his mother's breast (verse 2). A breastfeeding baby can be satisfied--but only temporarily. Note furthermore that this does not mean David views himself as independent of God and no longer in need of His provision. Indeed, a weaned child must still be taken care of and fed by his or her mother. Certainly God will continue to provide and care for all His people--and they should look to Him in confident hope for the present and for eternity to come (verse 3).
Thus, humility, maturity to a point of settled and ongoing contentment, and faith in God's promises are important focuses to maintain in observing God's festivals and in living godly lives generally in the lifelong march to His Kingdom.