What is the unforgivable sin — and could I have committed it?

Let the worry itself reassure you first: people who fear they have committed the unforgivable sin almost certainly have not. That very fear and longing for God is the opposite of the hardened, deliberate, persistent rejection the passage describes. Jesus' warning about blasphemy against the Holy Spirit, in context, addressed religious leaders who saw His undeniable works, knew they were of God, and willfully attributed them to the devil. It describes a settled, knowing, final hardness against the Spirit's witness — not a moment of doubt, anger, or a word said in pain. The gospel's reach is staggering: murderers, persecutors, adulterers, and idolaters have all been forgiven. The only sin that finally damns is the refusal to come to Christ at all. As long as you can still turn to Him, the door stands open. Scripture: John 6:37 — “Him that cometh to me I will in no wise cast out.” Take this step: Take your fear straight to Jesus in prayer and rest on His promise that He will never cast out anyone who comes. If the anxiety persists, talk it through with a pastor.