Why can't blaspheme be forgiven and what is blaspheme?

Answer 1

Blasphemy is a contemptuous act of speaking ill about God. Anything offensive about God or sacred things is called blasphemy and for obvious reasons, it is unforgivable.

Offending God is a sin. It can't be forgiven.

Another perspective:

Blasphemy is the act or offense of speaking sacrilegiously about God or sacred things; profane talk.

The New Testament makes specific comment on the seriousness of blasphemy against the Holy Ghost in Matthew 12:31-32.

31 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.

32 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.

Blasphemy against the Holy Ghost is in its own category because it entails rebellion against a sure knowledge of God and the truth. Satan falls into this category because he knows perfectly well who God is and what good and evil are and yet chooses to seek to fight against God. To commit this sin you have to be beyond just believing in the truth; you must know it for a fact after having had the truth of it manifest to you through a direct revelation from the Holy Ghost. One must reach the state of the Apostle Peter reflected in Matthew 16:15-17.

15 He saith unto them, But whom say ye that I am?

16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.

17 And Jesus answered and said unto him, Blessed art thou, Simon Barjona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven.

At this point, if Peter had chosen to fight against the truth and wholly try to destroy it, he would have been unable to be forgiven - mainly because he would have reached a point where he would refuse to be forgiven and deny the need for forgiveness. You have to be at a point similar to looking at the Sun and denying that it is shining and convinced yourself that it is not and making every effort to convince others of that. Honestly nearly all of us are operating at a level of FAITH and are not capable of blasphemy against the Holy Ghost. The more certain your knowledge however, the closer you are straying in the direction of blasphemy against the Holy Ghost when you rebel against what you know to be good. It is better to hunger and thirst after righteousness than to indulge the Carnal Man.