Gratitude, in this case, that's not a secret. The prayer is expressed in the company of the congregation.
Not surprisingly, since the lectionary has chosen it to accompany the reading about Solomon's granted request for wisdom, this psalm voices gratitude for the wisdom of God:
The works of his hands are faithful and just;
all his precepts are trustworthy.
They are established forever and ever,
to be performed with faithfulness and uprightness.