A systematic Reformed treatment of humanity's fallen condition and God's providence, tracing creation's transition to preservation and the sovereign governance that orders all events. It analyzes the possibility, origin, essence, spread, and punishment of sin while balancing human responsibility with divine sovereignty. The person and work of the Mediator are presented within the covenant of grace, and the redemptive office of Christ is carefully examined. The volume concludes with the benefits of the covenant and a concise ordo salutis, addressing calling and regeneration, faith and justification, and sanctification and perseverance through sustained biblical exegesis and doctrinal reflection.