Why don’t you doubt what you say can’t be proven?
I do not need to have proof because I have good evidence. I have no doubt that my evidence is accurate. I have thus proven it to myself.
IOW, you can’t verify the only thing that would make him a Messenger of God.
True, but I can verify in my own mind that He told the Truth about the revelation He received so that is my verification. Aside from that, I can read what He wrote and know it if from God because there is no other logical explanation for what He wrote. It is so majestic.
But aside from what He wrote about God and spiritual matters, Baha’u’llah wrote about many practical matters. We know that Baha’u’llah did not have more than a rudimentary education so there is no explanation as to where He acquired the knowledge that He had.
Not only did Baha’u’llah know things He did not learn in any school, He also predicted many things that later came to pass. Here is a partial list of specific things Baha’u’llah knew and things He predicted that later came to pass:
1. The fall from power of the French Emperor Napoleon III and the consequent loss of his empire.
2. The defeat of Germany in two bloody wars, resulting in the 'lamentations of Berlin'.
3. The success and stability of Queen Victoria's reign.
4. The dismissal of 'All Pasha as prime minister of Turkey.
5. The overthrow and murder of Sultan 'Abdu'l-'Aziz of Turkey.
6. The break up of the Ottoman Empire, leading to the extinction of the 'outward splendour' of its capital, Constantinople.
7. The downfall of Nasiri'd-Din Shah, the Persian monarch.
8. The advent of constitutional government in Persia.
9. A massive (albeit temporary) decline in the fortunes of monarchy throughout the world.
10. A worldwide erosion of ecclesiastical authority.
11. The collapse of the Muslim Caliphate.
12. The spread of communism, the 'Movement of the Left', and its rise to world power.
13. The catastrophic decline of that same movement, triggered by the collapse of its egalitarian economy.
14. The rise of Israel as a Jewish homeland.
15. The persecution of Jews on the European continent (the Nazi holocaust).
16. America's violent racial struggles.
17. Baha'u'llah's release from the prison of 'Akka and the pitching of His tent on Mount Carmel.
18. The seizure and desecration of Baha'u'llah's House in Baghdad.
19. The failure of all attempts to create schism within the Baha'i Faith.
20. The explosive acceleration of scientific and technological progress.
21. The development of nuclear weapons.
22. The achievement of transmutation of elements, the age-old alchemist's dream.
23. Dire peril for all humanity as a result of that achievement.
24. The discovery that complex elements evolve in nature from simpler ones.
25. The recognition of planets as a necessary byproduct of star formation.
26. Space travel.
27. The realization that some forms of cancer are communicable.
28. Failure to find evidence for a 'missing link' between man and ape.
29. The non-existence of a mechanical ether (the supposed light-carrying substance posited by classical physics), and its redefinition as an abstract reality.
30. The breakdown of mechanical models (literal images) as a basis for understanding the physical world.
From:
Gary L. Matthews, The Challenge of Baha'u'llah