You cannot imagine -- or, maybe you can -- how many religious people, mostly religious leaders, say to me, "I agree with much of what you say... much ...
The unforgivable sin certainly hurts other people. We can influence others to reject God's work, and we can curse people who are just beginning to experience grace and freedom. But this sin's primary danger lurks in its capacity to corrupt the self.
As Archbishop Desmond Tutu famously said, there is no future without forgiveness; we might add there is no livable present without the possibility of repairing the past.