Yep, it’s a big big deal.
Mark 3.28-30 • Matthew 12.31-32 • Luke 12.10
Fairly soon after we become Christians, we hear a rumor going round that there’s such a thing as an unpardonable sin: If we commit it, we’re doomed. God’s grace apparently has a limit, and this crosses it. Do it and you’re going to hell. Game over, man, game over.
Problem is, the rumor doesn’t always tell people what this unpardonable sin is. I’ve had newbies ask me whether it was murder. (Nope; Moses and David were murderers, y’know. Arguably so was Paul.) Others figure any of the seven deadly sins are unpardonable. (Nope; still not it.) When I was a kid, I thought cursing God would do it. (Still nope.) According to Jesus, it’s when we commit the sin of blasphemy—but not against the Father nor himself, but specifically against the Holy Spirit.
So there y’go: Everyone can be forgiven anything and everything. But the single, massive exception is when people blaspheme the Holy Spirit. Do that, and you’re sitting out the age to come. No New Jerusalem for you. Just weeping and gnashing of teeth.
Scary, right? Hence people wanna make sure they never, ever commit this crime.
Problem is, instead of learning what blasphemy is and avoiding it, and particularly avoiding it when it comes the Spirit, many foolish Christians have invented some strange explanations and redefinitions of what blaspheming the Spirit means. Largely because what they and their friends are currently doing comes mighty close to it. If not actually goes there already. And they’re in deep denial about it.