Is there a better picture anywhere of a redeemed, satisfied life than in Psalm 40:2-3? You can hear the song. You can feel the joy and gratitude. Nothing smacks of new life like a heart so gloriously set free.
This is what knowing God is supposed to look like. Our world would come to Christ more zealously if they thought less about stained glass windows and ceremonies, and more about the proven testimony of the Psalmist in these wonderful words. There is a string of pictures in these two verses. Each one builds on the previous. Picture follows picture, and every one adds a new sense of wonder and freedom.