Matthew 12:32

And whosoever speaks a word against the Son of man, it shall be forgiven him: but whosoever speaks against the Holy Spirit, it shall not be forgiven him, neither in this world, nor in the world to come.
All Commentaries on Matthew 12:32 Go To Matthew 12

Augustine of Hippo

AD 430
Against this unmerited gift, against this free grace of God, the impenitent heart may continue to murmur. So it is unrepentance that is a blasphemy against the Spirit. It is not forgiven either in this world or in the next. Think of a person whose sins are entirely forgiven in faithful baptism and whom the church has welcomed. This is the very church commissioned to remit sin, in which whatever sins it remits are promised to be truly remitted. You are speaking a very evil, utterly graceless word against the Holy Spirit, you are speaking it in thought or out loud, if when the patience of God is beckoning you to repentance, you harden your impenitent heart. By doing so you store up wrath for yourself on the day of wrath and of the revelation of the just judgment of God, who will render to us all according to our works. This is the impenitence that is called both by the name of blasphemy and speaking against the Holy Spirit, which will never be forgiven. This is the flagrant impenitence against which both the herald and the Judge cried out when they proclaimed: “Repent, for the kingdom of heaven is near.” It is the same impenitence against which the Lord opened his mouth to preach the gospel. He preached against it when he foretold that the gospel itself was to be preached in the whole world; when he said to the disciples after rising from the dead that it was necessary for the Christ to suffer and to rise again from the dead on the third day; and for repentance and the forgiveness of sins to be preached in his name throughout all nations, beginning from Jerusalem. Yes, this refusal to repent has absolutely no forgiveness, neither in this age nor in the age to come, because repentance obtains forgiveness in this world in preparation for the next. .
2 mins

Knowing this first, that no prophecy of the scripture is of any private interpretation - 2 Peter 1:20

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