Why is eternal security important for Christians?

Eternal security is a fundamental doctrine in Reformed theology, emphasizing that once a person is truly saved, they cannot lose their salvation. This assurance is rooted in Jesus' promise in John 10:28-29, where He states, 'I give them eternal life, and they will never perish, and no one will snatch them out of my hand.' This assurance brings comfort and confidence to believers, knowing that their standing in Christ is secure based on His power and faithfulness rather than their own works. Furthermore, it reflects the grace of God, who has chosen His people and maintains their salvation, as seen in Romans 8:30, indicating that those whom He predestined, He also called; and those whom He called, He also justified; and those whom He justified, He also glorified.