The sermon explores the inherent need for the gospel, even among those who diligently pursue religious observance, demonstrating that external adherence to laws and rituals—whether through scripture mastery or practices like circumcision—cannot secure genuine closeness to God or transform the heart. It argues that true righteousness stems not from outward actions but from an inward circumcision of the spirit, emphasizing that even those who appear outwardly devout may still fall short of God's grace, while the gospel offers freedom from the burden of earning divine favor through performance, instead offering acceptance and assurance through Christ's sacrifice and life.