This essay delves into the contrasting perspectives of Martin Luther and John Calvin on the concept of the Two Kingdoms – the Kingdom of God and the Kingdom of Man. It examines Luther's argument for the separation of secular and spiritual authority, emphasizing the Christian's role in both realms, including submission to secular governance while maintaining spiritual freedom. The essay then explores Calvin's similar yet nuanced views, highlighting the importance of Christians engaging in public life and contributing to society while maintaining their faith. The essay analyzes their ideas regarding obedience and disobedience, and how they believed Christians should navigate the relationship between religious and secular law. Furthermore, it addresses the implications of their views on modern secularism and the separation of faith from public affairs, drawing on the provided quotes and perspectives to highlight key arguments and differences between the two reformers.