Can you supply some texts where it states, post-cross, that the unforgivable sin is unbelief? Because if so, the gospel is pretty much moot... What I mean is, if unbelief is unforgivable, and we are to preach to those who are unbelievers, then what's the point...if unbelief is unforgivable.
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Matthew 12 NASB
31 "Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 32 "And whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come."
The Pharisees had long observed the sinless Jesus Christ. They observed him doing undeniable and powerful miracles that were, at the very least, clear evidence of power supplied by God. These impressive miracles were freely given in pure kindness and love to release people from obvious suffering and the oppression of horrible evil.
However, the Pharisees had so firmly set their hearts against accepting Jesus as the Messiah that they rejected the obvious truth before them and perversely twisted it to influence the crowds. They publicly credited the most ultimately evil being in the universe with these precious, godly miracles. In other words, they called the precious and holy Spirit of God, the unclean spirit of Satan. In effect, they charged Jesus Christ with sorcery; one who is in league with Satan. These charges are not only appalling and extremely serious, but clearly absurd. As Jesus immediately responded,
Mark 3 NASB
23 "How can Satan cast out Satan?
24 "If a kingdom is divided against itself, that kingdom cannot stand.
25 "And if a house is divided against itself, that house will not be able to stand.
26 "And if Satan has risen up against himself and is divided, he cannot stand, but is coming to an end.
27 "But no one can enter a strong man's house and plunder his goods, unless he first binds the strong man. Then indeed he may plunder his house.
28 "Truly, I say to you, all sins will be forgiven the children of man, and whatever blasphemies they utter, 29 "but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin" --
30 for they were saying, "He has an unclean spirit."
Speaking against the Son of man might be due to a failure to recognize Him for what He is. Three times in Acts, we read of how Paul was delivered from this state. Twice he testifies how in his pre-Christian days he thought it his duty to oppose the name of Jesus of Nazareth. But if, having seen the light on the Damascus Road, he had deliberately closed his eyes to it and kicked out against the goad which was directing him into the true path, that would have been the sin against the Holy Spirit. The Holy Spirit persuades and enables men to accept Christ and enjoy the saving benefits of the gospel [John 16:8; 1 Corinthians 2:12-14; Acts 7:51], but if anyone refuses to submit to the Spirit's gracious constraint, preferring to call good evil and evil good, how can the gospel avail for him?
But you must also note that Jesus is speaking of an attitude here, the very attitude Paul writes of himself having held. The man who is set against Christ and speaks against the Holy Spirit's calling of him to repentance has no mind to consider he is wrong, and in need of repentance. Jesus does not exclude repentance as delivering someone out of this state. He merely says that, as long as a man has this attitude, he is irremediable. He does not say repentance cannot come, if the man will open his heart. Just that, in this state, he is lost.