Psalm 29 recalls what God is like – he is powerful and shakes nature. People in the temple respond by crying “Glory.” In Psalm 28, the psalmist seems frustrated that God does not seem to be responding. He doesn’t want to get mixed up with the wicked people – people who seem nice on the outside but are truly cruel. Psalm 31 has these same themes. Psalm 30 could be seen as a response to Psalms 28 and 31. In Psalm 30, David sees how God has delivered him, and he’s very relieved and joyful.