When is a free gospel also an obligation (to both preacher and hearer?) We reflect on the Apostle Paul's joy in preaching a gospel that is without charge (1 Corinthians 9:18-27). He emphasizes the concept of 'gospel liberty' - the freedom found in spreading the good news without charge, which allows him to distance himself from false apostles and highlights the grace of God. But he proceeds to highlight the paradox that his free gospel puts him under an urgent obligation to all men.