The Psalm for Sunday is the Twenty-Third Psalm ("The Lord is my shepherd..."), a well-loved Psalm that is kind of the stereotype for all of the sheep-related imagery in the Bible. The Twenty-Third Psalm is all about the Lord taking care of the sheep - how richly God provides, and how God provides in even the worst of times.
When I was a growing up, I had an aunt (really, she was my mom's cousin) who always sent me a funny card for my birthday and for Christmas, with a crisp new bill tucked inside it. My mom would remind me to send a thank you note, and usually I did. But even if I didn't, I could look forward to her card (and the crisp new bill) showing up at the next holiday.
She sent the card not because I deserved it, but because that's who she was.
It's kind of like that with the imagery in the Twenty-Third Psalm. What do sheep do to deserve all that the shepherd provides for them? Not much - and that's the point. God provides not because we deserve it, but because that's who God is.
More on this tomorrow.