Jesus’ words, as I recall, were that anyone who blasphemes against the Son of Man (i.e. Jesus himself) may be forgiven, but he who blkasphemes against the Holy Spirit will not.
What’s the difference? Well, MY interpretation (take it for what it’s worth) is this: during Jesus’ lifetime, he was widely attacked and condemned by people who thought he was a blasphemer, a madman, a fraud, or just a seditious troublemaker. Jesus was saying that THOSE people might yet be forgiven, because they didn’t really understand him or what he was all about. That’s why, on the cross, he prayed, “Forgive them Father, for they know not what they do.”
That is, even the people who killed Jesus had hope of redemption, because they weren’t knowingly killing the son of God- they sincerely thought they were only killing a human criminal.
But people who’ve actually seen or felt the presence of the Holy Spirit, people who actually recognize divinity… what of them? Well, those people know that God is real, and they know that Jesus was his son. If THOSE people blaspheme, well, there’s no real hope for them, is there?
If you buy my reasoning, well, there may be hope for all kinds of unlikely people. A virtuous atheist who dismisses Jesus as a myth may yet make it into heaven. Someone who never knew of Jesus may be shown mercy. But one who KNOWS that Jesus is God, and who nonetheless rejects him cannot have salvation.
As for suicide… well, there are all kinds of reasons people kill themselves. Sometimes, there is a definite element of cruelty in the act (not only is the victim ending his own life, but he’s deliberately leaving his loved ones with an eternal guilt trip). Sometimes, it’s a matter of simple human weakness and fear.
In my opinion, suicide is a trerrible thing, often a sinful thing… but since the God I believe in was human once, and agonized in the garden of Gethsemane (to the point of sweating blood) over the things he knew he would have to suffer… I have to think that God could understand and forgive a human who wanted to die, rather than experience terrible suffering.