From Dr. Timothy Keller's series: "Practicing The Christian Life", this sermon looks at Psalm 1:1-6, which is the introduction to the Psalter, the prayer book of the Bible.
"Psalm 1 says that meditating on the Scripture is what will bring blessedness—absolute well-being. The magnitude of that claim, and in some ways the simplicity of the claim, is easy to miss. Yet here, smack in the middle of the very introduction to the Psalter, we’re told that not just belief in God but meditating on the law of God, on the Scripture, is the key to blessedness.
This is an extremely important, crucial part of what it means to be a Christian. There are three things I’d like to show you here: what meditation promises, how it’s practiced, and why it works."