It's always good to be thankful when you receive a gift, even if it's not exactly what you wanted! When regular people give us a gift we don't want, we say "thank you" to be polite. But when God gives us something we don't want, we say "thank you" to show Him that we recognize that He knows what's best for us. It's hard to be thankful when things don't go our way, but, no matter what happens, we can offer God a sacrifice of thankfulness!