"Ben: Thomas the apostle... When Jesus wanted to return to Judea, knowing that he would probably be murdered there, Thomas said to the others, "Let us also go that we might die with him." But Thomas was not remembered for this bravery. His claim to fame came later, when he refused to acknowledge the resurrection. He just couldn't wrap his mind around it. The story goes that he needed to touch Jesus' wounds to be convinced.
Jack: So, was he?
Ben: Of course he was. We're all convinced sooner or later Jack.
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Ben's memory is somewhat out of whack there. Either that, or he's just not concerned with context.
Thomas speaks that phrase not necessarily as a matter of bravery. That account is from the Gospel of John, specifically during the account of the raising of Lazarus from the dead . [LOST-wise, I think that's the reference I'm supposed to point out... that it's a reference to a resurrection story in two ways, with Lazarus being primary, and the future doubtfulness of Thomas secondary*.] Jesus relates to the disciples that Lazarus is dead.
Jesus also implies that the death is more or less a positive thing, for through it, Jesus will be able to glorify God. And so, Thomas says "well, let's ALL go die, along with Lazarus"
Scholars typically consider his words to be ambiguous, because in virtually the same breath was the warning about those in Judea plotting to kill Jesus, so Ben isn't coming out of left field when he suggests that Thomas was being brave there, but even still, Thomas nor any of the assembled listeners that day really knew what Jesus was talking about, or what the significance of his death would be.
* But, consider the analogue:
Jack has SEEN one "resurrection" - His own father's. Yet, he is the doubter of the second: Locke's. He's a Thomas in two ways therefore. He's doubtful that any of what he is hearing makes sense, but he is also doubtful that what he has seen once could happen twice."