The document discusses the importance of applying biblical discernment when choosing a church. It says the key issues that should drive our choice are matters of doctrine regarding God, the Bible, and the gospel. It provides biblical support for the doctrine of God as one in three persons. It emphasizes that the Bible is the infallible rule of faith and outlines what the gospel teaches based on passages from 1 Corinthians - that Christ died for our sins and was resurrected. It stresses the centrality of the cross and gospel in the Christian life.