Christians are commanded to be unified in Christ, but how do we know who is a Christian to be unified with and who is a false believer to be evangelized or avoided (false teachers)? What about denominations? How do I know who is a faithful brother or sister? More than that, what do we need to do to build unity in the Church that Jesus has bought with His own blood? Sometimes it seems that those calling for unity are the ones pressing false doctrine, but if we are not careful, those with good doctrine will cut off faithful Christians who simply aren’t mature in the faith enough to be grounded doctrinally. This sermon addresses all this and more from Ephesians 4:1-16.