In Philippians 2:12 Paul says, “…work out your own salvation with fear and trembling.” What does this mean? We have been truly born of God; we have received salvation. What, then, does it mean to work out our salvation, and how can we do such a thing? In this booklet compiled from Life-study of Philippians, Witness Lee presents the answers to these questions and offers a deeper view of Paul’s word to the Philippian believers.