The sermon discusses the concept of 'steadfast service' as a fundamental aspect of following Jesus, who is portrayed as the 'anonymous Christ' present in our interactions with others. It emphasizes the importance of living selflessly and serving others, while interpreting Jesus' teachings about the kingdom of God as a spiritual realm that should be manifested in our actions on Earth. The call to action is to identify and embrace the need for healing and service within our communities, reflecting the living presence of Christ in our daily lives.