Matthew 6: Sermon on the Mount Pt 2. How internal change is now manifest in motive and deeds.

After establishing that only internal changes of the heart are accepted in the coming Kingdom, Jesus now teaches on how these changes will be manifest in one's motives and actions. At the highest priority is one's relationship with God, and only with perfect priorities can one receive rewards from God. Otherwise, the best you can hope for is praise from people.
Jesus covers traditional religious activities such as giving, prayer, and fasting, pointing out that if any of these are done to impress people, they are void of value.
He give the demonstration of what is traditionally called "The Lord's Prayer", showing us proper priorities.
Jesus then discusses worrying -- with a conclusion that the only thing we need be concerned about is the furtherance of the Kingdom.