Whoever speaks a word against the Son of Man, it shall be forgiven him; but whoever speaks against the Holy Spirit, it shall not be forgiven him, either in this age or in the age to come.
The only unforgivable sin is blasphemy against the Holy Spirit. After His resurrection Jesus gave His disciples the instruction to remain in Jerusalem until they received power from on high. That power was disciples would receive the Comforter promised by Jesus before his death on the cross. In the book of Acts we see the terrible consequences of those who sought to circumvent the Holy Spirit.
Today, there are many Christians who think that manifestations of the Holy Spirit are things of the past, from apostolic times and are no longer possible to experience. These brothers who think this could easily fall into the terrible sin of blaspheming the Holy Spirit. We have also seen cases of false prophets, professional liars who have faked illness and then give false testimonies of healing and mocking the powerful manifestation of God with the sole purpose to deceive and manipulate the gullible believers to seize unwary. This is another way of blaspheming the Holy Spirit.
Another manifestation of blasphemy against the Holy Spirit is to ensure that He is simply a force or energy emanating from God, denying His existence or His divinity. The Bible clearly identifies the personal character of the Holy Spirit. It is not possible that a force or energy have emotions like sadness or joy; but a person does have them. Therefore, those who say that the Holy Spirit is a force are wrong completely.
We will fail many times to God in our lives, in fact, already at an early age, each of us have been committing many sins. The goodness of our Creator has allowed us to be forgiven through repentance. However, be careful with what we do because there is an exception to the rule of forgiveness and that is the sin against the Holy Spirit which will never be forgiven. Let not fall into so terrible mistake!
Many refuse to believe in the divinity of the Holy Spirit, but the Bible is very clear on this. For example, let’s see what says 1 John 5: 7: So there are three witnesses in heaven: the Father, the Word and the Holy Spirit, and these three are One. John himself also said that the Word was God; therefore, if the Holy Spirit is one with the Father and the Word, He is God, without a doubt. It is not about whether or not we understand the unfathomable mysteries of God and His nature, what is it that we obey His Word and believe what He says without trying to give an explanation for what is beyond our intellectual understanding. Let us use our faith and avoid falling victim to the unforgivable sin. God bless you.