Worship by Max Lucado:

 We hear a lot about “worship”—but what is it exactly? Worship is when you’re aware that what you’ve been given is far greater than what you can give. Worship is the awareness that were it not for God’s touch, you’d still be hobbling and hurting, bitter and broken. Worship is the “thank you” that refuses to be silenced.
Oh we’ve tried to make a science out of worship. We can’t do that any more than we can “sell love” or negotiate peace.” Worship is a voluntary act of gratitude offered by the saved to the Savior, by the healed to the Healer, and by the delivered to the Deliverer.
If you and I can go days without feeling an urge to say “thank you” to the One who saved, healed, and delivered us, then we’d do well to remember what He did!
“All this is for your benefit, so that the grace that is reaching more and more people may cause thanksgiving to overflow to the glory of God. 2 Corinthians 4:15”
From In the Eye of the Storm