David encourages himself to praise God, 1-4. He prays for God's assistance according to his promise, 5-10. His confidence in God's help, 11-13.
1 [A Song or Psalm of David.]
O God, my heart is fixed./ 
I will sing and give praise, even with my glory.
2  Awake, psaltery and harp./ 
I myself will awake early.
3  I will praise you, O LORD, among the people,/ 
and I will sing praises to you among the nations.
4  For your mercy is great above the heavens/ 
and your truth reaches to the clouds.
5  Be exalted, O God, above the heavens,/ 
and your glory above all the earth,
6  So that your beloved may be delivered./ 
Save with your right hand, and answer me.
7  God has spoken in his holiness: "I will rejoice./ 
I will divide Shechem/ 
and measure out the valley of Succoth.
8  Gilead is mine./ 
Manasseh is mine./ 
Ephraim also is the strength of my head./ 
Judah is my lawgiver.
9  Moab is my wash-pot./ 
Over Edom I will cast out my shoe./ 
Over Philistia I will triumph."
10 Who will bring me into the strong city?/ 
Who will lead me into Edom?
11 Will you not, O God, who have cast us off?/ 
And will you not, O God, go forth with our armies?
12 Give us help from trouble,/ 
for vain is the help of man.
13 Through God we shall do valiantly,/ 
for he will tread down our enemies.
Matthew Henry Commentary - Psalms, Chapter 108[➚]
John Calvin's Chapter Summary:
Calvin did not provide a summary of Psalm 108.