How do we know believers are secure in Christ?

The assurance of a believer's security is deeply integrated into the New Testament, particularly in John 10:28-29, where Christ states, "And I give unto them eternal life; and they shall never perish, neither shall any man pluck them out of my hand." This passage highlights that both the Father and the Son have believers firmly in their protective grasp, ensuring their eternal security. In Isaiah 49, God promises that even if a mother could forget her child, He will never forget His own, reinforcing that believers are graven on His hands. This is a profound expression of the security and intimacy that God has with His chosen people.