Church age believers have the Holy Spirit sealed within, it’s impossible for us to commit this sin, consciously or unconsciously. For example, some Corinthians accused other believers of cursing Jesus while speaking in tongues, but Paul in effect told them it was impossible because of the Holy Spirit’s presence within them. (1 Cor. 12:3) The same would hold true for us.
For our age, the unforgivable sin is to reject the pardon Jesus purchased for us with His life. Doing so puts us outside of God’s forgiveness because the death of His Son is the only remedy He has provided for our sin problem.
Matt. 12:30-32 was directed toward the Pharisees who watched with their own eyes while Jesus performed miracles of various kinds. They refused to believe He was the Messiah their own scriptures had foretold so they attributed His miracles to the only other supernatural force they knew, the devil (Matt. 12:24). In other words, they didn’t do this out of ignorance but out of malicious intent.
When He took on human form, Jesus set aside His God-like power and performed His miracles through the power of the Holy Spirit, so these Pharisees were blaspheming the Holy Spirit. By saying they would not be forgiven in this age or the age to come Jesus was saying that by their deliberate unbelief they had sealed their eternal destiny.
“Church age believers have the Holy Spirit sealed within, it’s impossible for us to commit this sin, consciously or unconsciously.”
That depends on one’s views on “eternal security”. I think Hebrews 6 makes it clear a believer CAN choose to reject God and salvation:
“4 For it is impossible, in the case of those who have once been enlightened, who have tasted the heavenly gift, and have shared in the Holy Spirit, 5 and have tasted the goodness of the word of God and the powers of the age to come, 6 and then have fallen away, to restore them again to repentance, since they are crucifying once again the Son of God to their own harm and holding him up to contempt. 7 For land that has drunk the rain that often falls on it, and produces a crop useful to those for whose sake it is cultivated, receives a blessing from God. 8 But if it bears thorns and thistles, it is worthless and near to being cursed, and its end is to be burned.”
That looks like it is written specifically to show believers CAN fall away. Maybe not often, but I knew a guy who sure SEEMED like a Christian who then utterly rejected Jesus.
God alone knows a man’s heart. We don’t even truly know our own. I prefer to trust in eternal security while acting as if it doesn’t exist.