The King and His Kingdom: Matthew 6:25-34 Seek First

This week's passage, Matthew 6:25-34, sure seems a lot like singing with Bobby McFerrin, "Don't Worry Be Happy," which is easier said than done (amiright?). So there must be more to it than that. Towards the end of this passage comes one of Jesus's famous sayings, "Seek first the kingdom of God and God's righteousness, and all these things will be given to you as well." But what does that really mean? And what doesn't it mean? 

Grace and peace, Joanne