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Can a person today commit the unforgivable sin, and how would they know?

Inferred

No single verse settles it; the conclusion is assembled across texts and leans one way.

The text states that blasphemy against the Holy Spirit is unforgivable, and the occasion it describes, knowingly and persistently attributing the Spirit's work to Satan, is the clearest definition the text gives. Whether that exact condition can be replicated today is an inference the text does not settle directly, and the text gives no reliable self-diagnostic test.

Jesus' own words state the sin is unforgivable (Matthew 12:31–32; Mark 3:28–29; Luke 12:10), and the narrator of Mark identifies the occasion as the Pharisees' charge that Jesus worked by Beelzebul (Mark 3:30). Whether the precise conditions of that occasion, seeing Jesus perform miracles in person and attributing them to Satan, can be reproduced today is an inference, not a direct statement.

What scripture leaves unaddressed: The text is silent on two specific sub-questions: (1) whether the precise conditions of the Beelzebul occasion, direct eyewitness to Spirit-empowered miracles followed by deliberate satanic attribution, can be reproduced in every era; and (2) what reliable internal or external signs would identify that a person has committed this sin rather than some other serious sin.

Key texts:
Matthew 12:31-32Tier 2 · Jesus
“Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men. Whoever speaks a word against the Son of Man, it will be forgiven him…”
Matthew 12:22-28Tier 3 · Apostle
“Then one possessed by a demon, blind and mute, was brought to him; and he healed him, so that the blind and mute man both spoke and saw. All the multitudes were amazed, and said, “Can this be the son …”
Mark 3:28-29Tier 2 · Jesus
““Most certainly I tell you, all sins of the descendants of man will be forgiven, including their blasphemies with which they may blaspheme; but whoever may blaspheme against the Holy Spirit never has …”

…and 10 more verses weighed in the full analysis.

This is a summary.

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