"To David, to You, O Lord, I lift up my soul." This is what the verse (Deuteronomy 24:15) says, "On his day you shall give him his wage." The Holy One, Blessed be He, said to David, "David, why do you lift up your soul to Me?" He replied, "Because I am an employee in Your world," as it says (Job 7:2), "Like a servant who longs for the shade, and like a hireling who awaits his pay."
And it is written in the Torah (Deuteronomy 24:15), "On his day you shall give him his wage," etc., and to Him, he (David) lifts up his soul. If this worker who is his employer's hired hand is obligated to pay him on time and to him he lifts up his soul, how much more so are our souls dependent upon You! Another interpretation: "To You, O Lord." This refers to the generation of the destruction of the Temple, who suffered because of the desecration of God's name, as it says (Deuteronomy 24:10), "If you lend your neighbor a loan," etc.