Blasphemy is an expression of one’s opinion that someone has done something wrong. Does that mean that blasphemy against the Holy Ghost is saying that the Holy Ghost has done something wrong? No, because the word “blasphemy” is being used figuratively; specifically, the word “blasphemy” is being used to mean “rejection.” The explanation of this figurative usage is that when you say that someone has done something wrong it is because you believe they have done something wrong and when you believe they have done something wrong you reject them.
So is blasphemy against the Holy Ghost the rejection of the Holy Ghost? No, what is being rejected is not the Holy Ghost himself. Rather, it is a message of the Holy Ghost and the subject of that message that is being rejected. The message is that the Lord Jesus Christ paid for our sins and the subject of the message is, of course, the Lord Jesus Christ. The acceptance of this message (sin payment) and the subject of the message (Jesus) is followed by forgiveness and salvation. The rejection of this message (sin payment) and the subject of the message (Jesus) is followed by continued absence of forgiveness and salvation.
Now, some have said that a person who rejects the Lord Jesus Christ once can never be forgiven and given salvation but Hebrews 6:4-6 (see below) says that a person who rejects the Lord Jesus Christ can never be forgiven as long as they continue to reject the Lord Jesus Christ. If they stop rejecting him and accept him, they will be forgiven and given salvation. This is made clear in Hebrews 6:6 in the words “seeing they crucify to themselves the Son of God afresh.” These words mean “in view of the fact that (“because”) they crucify to themselves the Son of God afresh.” It is the continued “crucifying to themselves (rejecting)” that makes forgiveness and the gift of salvation impossible in this life and, if they die, impossible in the next life.
We have provided what is most important for you to know but we can go far deeper on this subject.
Here are some key Bible passages on the subject we are dealing with:
Matthew 12:31-32 “Wherefore I say unto you, All manner of sin and blasphemy shall be forgiven unto men: but the blasphemy against the Holy Ghost shall not be forgiven unto men. And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.”
Mark 3:28-29 Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies wherewith soever they shall blaspheme: But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation:”
(Hebrews 6:4-6) “For it is impossible for those who were once enlightened, and have tasted of the heavenly gift, and were made partakers of the Holy Ghost, And have tasted the good word of God, and the powers of the world to come, If they shall fall away, to renew them again unto repentance; seeing they crucify to themselves the Son of God afresh, and put him to an open shame.”