Verses 1-6 speak of God's glory as revealed to all the world, in verses 7 to 13 the emphasis shifts to our knowledge of God as revealed in His law. Verses 11-13 shift to the psalmist, how the words affect him. The "great reward" of verse 11, but also the concern which builds in the next 2 verses that we need to to more, that we do not understand the law as well as we need to. We come at the end through the prayer in verse 14 to realize that it is only through GOD that we can hope to understand the law.