Memorizing Psalms

With the closing of 2011 I am personally ending my year long focus on Psalm 26. Though I need to develop a lesson from my considerations I am looking forward to the next psalm I will ponder; psalm 19. The contrast between these two psalms is interesting. Psalm 26 is a call to God for his deliverance from oppression and false accusation. I imagine David penned the poem after hearing reports of king Saul's tirades against his character. We know that David was vindicated but it took a great deal of faith for him to allow God to work. Psalm 19 is a song of worship. No requests are offered until the end of the psalm. Then they are requests for purity and grace. Which are prayers God is always seeking to answer.
Stuart