In synopsis 1 Corinthians addresses such questions as disunity, fornication, litigation, mixed marriages, unmarried virgins, food sacrificed to idols, and abuse of spiritual gifts. It stresses the importance of love (ch. 13) and the doctrine of the resurrection of Jesus (ch. 15). A basic truth taught in this book is this: we are set apart for the Lord by his Spirit. An incidental contribution of 1 Corinthians is the insight it gives into the life of a Christian congregation in the days of the apostles.