Pastor Sue Coller emphasizes the idea that one cannot live in both the realm of God and the world simultaneously, that we ultimately have to choose one over the other. The Kingdom of God is portrayed as subversive and defying logic, with a focus on values such as generosity, service, and lack of grudges. The sermon contrasts this with the world, highlighting its potential for debt, self-interest, and lack of support for others. Despite the challenges, it ultimately presents the listener with the choice of who they want to be in the world - a kingdom person or a worldly person.