Pastor Kenneth Wagner's sermon "First Things First" discusses putting God first in all aspects of life. He emphasizes the innate desire to be first and connects it with the biblical concept of prioritizing God. Through biblical references, he highlights God's call to put Him first, especially in areas like finances. Pastor Kenneth encourages obedience in tithing, shares a family's testimony of God's provision, and offers resources for the congregation to deepen their understanding and practice of putting God first.