Re: eternal life
Blasphemy is insulting or having lack of reverence for God, the act of claiming the attributes of divinity, irreverence toward something considered sacred for instance the bible. It is a sin of the tongue and not action. The only unforgivable sin is the constant rejection of Christ's offer of salvation, which is His gift of eternal life. Blasphemy against the Holy Spirit is CONTINOUSLY slandering God and rejecting salvation. I emphasized continuously because as long as a person remains in unbelief, he voluntarily excludes himself from forgiveness of sin. Now that is the unforgivable sin and if they continue in that manner eternal life with God is lost. But if this person realizes their fault and asks for forgiveness, God will forgive.
So if you think you have blasphemed, do not make it an unpardonable sin by continuing in the sin. Ask God for forgiveness then you will be destined for heaven.
As for Revelation 22:18-19 John was referring specifically to the book of Revelation, but it implies to all scriptures. We are also warned about adding and diminishing from the scripture in Deuteronomy 4:2 "Ye shall not add unto the word which I command you, neither shall ye diminish [ought] from it, that ye may keep the commandments of the LORD your God which I command you." John and Moses are correct; we should not add or subtract from God's infallible word. But if you did it out of ignorance or wilfully and you ask for forgiveness, He will pardon. No sin is above forgiveness: "I, even I, am he who blots out your transgressions, for my own sake, and remembers your sins no more" (Isaiah 43:25).
I hope this helps.
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HE counts the number of the stars; HE calls them all by name. Psalm 147:4 (NKJV)
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