This lesson argues that the Bible is the sole and sufficient authority for the Christian life, grounded in eyewitness testimony and divine revelation rather than human invention. Drawing from 1 Corinthians 15, it emphasizes the resurrection of Jesus Christ as the central, non-negotiable foundation of the gospel, supported by early creedal statements and multiple witnesses. It also situates Paul’s teaching within the broader context of addressing a troubled church, showing that belief in the resurrection is essential to authentic faith and perseverance.