Can salvation be eternally secure while a believer's faithfulness still carries eternal consequences? The Boundaries of Grace presents Relational Security Theology (RST), a biblical framework for understanding the relationship between God's unchanging gift of eternal life and the believer's continuing accountability before Christ. The book distinguishes between relationship and fellowship, salvation and reward, eternal life and inheritance, and security and stewardship. It argues that regeneration establishes a permanent relationship with God that cannot be undone, while a believer's faithfulness can profoundly affect fellowship, inheritance, kingdom privilege, authority, and eternal reward. Through careful examination of Scripture, The Boundaries of Grace explores challenging passages concerning the Judgment Seat of Christ, the testing fire of 1 Corinthians 3, Ezekiel 44, the Ten Virgins, the Wedding Garment, the Unprofitable Servant, outer darkness, inheritance, and reigning with Christ. It also compares Relational Security Theology with Reformed/Calvinist and Arminian/Wesleyan approaches to salvation, perseverance, and biblical warning passages. At its heart, this book addresses a vital question: If eternal life is truly a gift of grace, what is at stake in the Christian life after salvation? The Boundaries of Grace offers an answer that takes both assurance and accountability seriously—grace secures the believer's relationship with God, while faithfulness still matters for eternity.