How do we know the doctrine of preservation of the saints is true?

The doctrine of preservation of the saints, often encapsulated in the 'P' of TULIP, asserts that those whom God has elected will be kept steadfast in their faith until the end. This has biblical grounding in passages such as Romans 8:28-39, which details how nothing can separate us from the love of God. Furthermore, Ephesians 2:8 teaches that faith itself is a gift from God, not a product of human effort, ensuring that genuine believers will not lose their salvation. Maintaining this doctrine is vital for assurance in the believer’s life, as it alleviates fears of falling away and emphasizes God's unwavering commitment to His people.