As Christians, our assurance of eternal life is, first and foremost, based on the salvific work of Jesus on the cross (Acts 4:12; Rom 5:8; 1 Cor 15:3-4), and the revelation of Scripture that we, who have trusted in Christ as our Savior (Acts 4:12, 16:31), “may know that [we] have eternal life” (1 John 5:13). This assurance is objective and constant, because God’s Word is sure and does not change.