Then a demon-oppressed man who was blind and mute was brought to him, and he healed him, so that the man spoke and saw. And all the people were amazed, and said, “Can this be the Son of David?” But when the Pharisees heard it, they said, “It is only by Beelzebul, the prince of demons, that this man casts out demons.” Knowing their thoughts, he said to them, “Every kingdom divided against itself is laid waste, and no city or house divided against itself will stand. And if Satan casts out Satan, he is divided against himself. How then will his kingdom stand? And if I cast out demons by Beelzebul, by whom do your sons cast them out? Therefore they will be your judges. But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you. Or how can someone enter a strong man’s house and plunder his goods, unless he first binds the strong man? Then indeed he may plunder his house. Whoever is not with me is against me, and whoever does not gather with me scatters. Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. 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. (Matthew 12:22–32)This tells how the religious leaders of Jesus’ day thought that His power came from Satan rather than God. Jesus called this the unforgivable sin. They, and many like them, do not think or teach that Jesus is God in human flesh. If the Holy Spirit is telling them otherwise and they are resisting Him, then this sin is not forgiven nor can it be — because the forgiveness included in redemption includes knowing who Jesus is. He is not “a son” or an empowered man, or only a prophet, or an angel, and certainly not an instrument of Satan. As been said, He is not a liar or a deceiver either.
The difficulty is that His identity must be revealed to a willing heart, and only the Holy Spirit can do that. While He is unlimited in the ways He might use, to deny what He says is unforgivable because knowing Jesus in a saving relationship must include knowing who He is. Denying His deity is the same thing as denying the Holy Spirit and that equates to ‘unforgivable.’
This is he who came by water and blood—Jesus Christ; not by the water only but by the water and the blood. And the Spirit is the one who testifies, because the Spirit is the truth. For there are three that testify: the Spirit and the water and the blood; and these three agree. If we receive the testimony of men, the testimony of God is greater, for this is the testimony of God that he has borne concerning his Son. Whoever believes in the Son of God has the testimony in himself. Whoever does not believe God has made him a liar, because he has not believed in the testimony that God has borne concerning his Son. And this is the testimony, that God gave us eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life. (1 John 5:6–12)Not understanding how God can be triune and yet one God is not an excuse for rejecting this reality. All that do that rationalize that if they cannot figure it out, it must not be true. Deeper still, those who believe it realize that if God had to become a man and die for my sin, then there is nothing I could do to earn or deserve it. How humbling is that! Of course human pride resists the Spirit telling us we are helpless without Him.
Lord Jesus, You reveal Yourself and make known Your identity to those who know and accept this: “For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast." (Ephesians 2:8–9) Thank You for making me aware of how much the Spirit of God is needed to be able to have a saving relationship with You through mercy and grace, and that my ‘goodness’ can never be good enough. I am eternally grateful!