There's one sin you never see -- that's the unpardonable sin.
You can't spot it in someone else, after all; that's because you don't know how grace has been offered to that person, or how it's been received.
Moses committed murder, remember.
David committed murder AND adultery.
Peter denied Jesus.
Yet all of them ended up forsaking their sin and following God.
No, you just can't tell if someone else has committed the unpardonable sin.
But if you think they have . . .
Then what does that say about you?