Christ is perfect; Christians are not. We may pretend to be what we’re not; or pretend not to be what we are. It may make us question whether or not we truly belong to Christ. For the believer, though, the blood of Christ covers every sin – past, present, and future. There is, however, one unforgivable sin; and in this message Alistair Begg explains what it is and how it separates a true Christian from an unbeliever.