How can we verify that what Jesus said about the afterlife is true? By the resurrection.
We have numerous lines of historical evidence, proof that the tomb of Jesus was found empty by a group of His women followers.
We have several lines of historical evidence established that on numerous occasions and at different places various individuals and groups saw appearances of Jesus alive from the dead.
and
Thereafter, Jesus appeared from the dead to the disciples,, including Peter, who then became proclaimers of the message of His resurrection. Also appeared to His brothers James and Jude, and to Saul. All four Gospels testify to these facts. Many more details can be supplied by adding facts that are attested by three out of four. So minor discrepancy should not affect our case.
What are these "numerous lines of historical evidence" and "several lines of historical evidence"? Outside of the bible, the only mention of a resurrection I am aware of , is a brief reference in the Testimonium Flavianum (by Josephus), which when translated reads something like:
About this time there lived Jesus, a wise man, if indeed one ought to call him a man. For he was one who performed surprising deeds and was a teacher of such people as accept the truth gladly. He won over many Jews and many of the Greeks. He was the Christ. And when, upon the accusation of the principal men among us, Pilate had condemned him to a cross, those who had first come to love him did not cease. He appeared to them spending a third day restored to life, for the prophets of God had foretold these things and a thousand other marvels about him. And the tribe of the Christians, so called after him, has still to this day not disappeared.
However, there are very good arguments to the effect that prior to the 4th century (or at least at around the time Oreigen read and commented on it), the relevant passage read something like:
Now there was about this time Jesus, a wise man. For he was a doer of startling deeds, a teacher of such men as receive the truth with pleasure. And he gained a following both among many Jews and many of Greek origin. And when Pilate, at the suggestion of the principal men amongst us, condemned him to the cross, those that loved him at the first did not forsake him. And the tribe of Christians, so named from him, are not extinct at this day.
So the reference to a resurrection seems to be an addition by Chritian apologists in around the 4th century. Therefore the only written evidence of a resurrection is in the bible alone.
I should point out:
- a missing body doesn't necessarily mean a resurrection;
- Mary Magdeline seeing Jesus on the Sunday morning but not recognising him raises serious credibility issues right there (same issue applies to the "appearance" on the road to Emmaus);
- of the 11 to 13 mentioned appearances, all but one was an appearance to a small private group (often the same group) or just an individual;
- the only public appearance mentioned (see 1 Cor 15:6) is not referred to in the 4 gospels or Acts. Further, if such a public appearance occurred, why are some apostles still doubting the resurrection afterwards (see eg Matthew 28:17) ;
- Saul/Paul wouldn't have known what Jesus looked like.
There have been many more documented sightings of Elvis, leprechauns etc. Even accepting the bible as accurate, apart from the supposed appearance to Paul, it is all second-hand accounts.
And why didn't Jesus just walk into Jerusalem on the Sunday morning and just yell: "Ha ha, I am back!" I think I know why.