After Psalm 130’s heart-rending cry, comes the peace of Psalm 131. The psalmist writes as a humble person who does not understand everything, but depends on the Lord.

O LORD, my heart is not lifted up;
   my eyes are not raised too high;
I do not occupy myself with things
   too great and too marvelous for me.
But I have calmed and quieted my soul,
   like a weaned child with its mother;
   like a weaned child is my soul within me (1-2, ESV).

Trusting in God produces a calm spirit, which the psalmist compares to a quiet child.

In the last verse of this extremely short psalm, the humble author calls the church to hope in the Lord forever. 

 O Israel, hope in the LORD
   from this time forth and forevermore (3, ESV).