Psalm 89 continues the praises God's unchanging covenant from the general to the specific and focused on the offspring of the Davidic king. Psalms' emotions and his remembrance of the sound doctrine of God's promise is also intensified. This section can be divided into three parts

Psalm 89:27-29 restates God's promise, 30-32 Restate the law. 33-37 The everlasting grace. 38-45 Crown in the dust, and king, together with the kingdom is humiliated. Shall the psalm stop here with no answer? No God already provided the answer in verse 27, the firstborn son. 

A faithful prayer is an honest one that reflects the reality, and it is also and humbles one that asks questions from God when the king is being humiliated. Perhaps God's answer is not yet him because the king he promised will be humiliated in front of the world, not just neighboring countries. He will be humiliated by his enemies and those he tried to save. The heaven and the earth will testify the resurrection of the firstborn son as well as the king of kings. He is the king for not only Israel but for the world. People experienced the benefit of having a good King David so they mourn the loss of the good king. But the grace God has promised is even stronger and greater. David was an anointed king, but he is also from Adam so he can only do what Adam did. He was a good king but also a murderer and adulterer. 

This world needs a king who will die for his people. The firstborn son will suffer the greatest on his throne by being witnessed with his humiliation in front of the world in order to save the world. All the world will testify his humiliation, his enduring of righteous anger, his underserving cross. David is a chosen king but he is not the king of the cross.  A king who suffered greater than David. A king who brings the eternal kingdom to whom calls upon his name. Those who believe in him shall never be ashamed.