Or a way for self-proclaimed messengers to claim they are Messengers of God, and offer no way for anyone to be certain about it. Essentially we are expected to just take your word for it?
“man can never hope to attain unto the knowledge of the All-Glorious, can never quaff from the stream of divine knowledge and wisdom, can never enter the abode of immortality, nor partake of the cup of divine nearness and favour, unless and until he ceases to regard the words and deeds of mortal men as a standard for the true understanding and recognition of God and His Prophets.” The Kitáb-i-Íqán, pp. 3-4
What it essentially says is that we will never discover the truth for ourselves if we use the words and deeds of other people as a standard by which to understand God and His Prophets. In other words, we cannot measure truth according to what other people say, think or do.
At the very end of a longer tablet, Baha’u’llah also wrote:
“For the faith of no man can be conditioned by any one except himself.” Gleanings, p. 143
What then do we do? We investigate the truth for ourselves rather than relying upon what other people say or do.
OK, three questions:
1) How does a mortal discern whether they are an actual Messenger of God and not just deluded about this status? Explain the test in reality that assures the self they aren't living in an illusion.
There 2) How does an authentic Messenger of God demonstrate to others that they are authentic and not just some delusional person? Offer that test in reality. Surely a God would offer guidance to a Messenger how to do this in a way that isn't disputable.
There is no test that will assure that everyone will recognize the Messenger because God did not want it to be easy. Nevertheless it will be easier for some people than for others because we are all have different capacities and backgrounds so we are all coming from a different starting point.
God does offer guidance to the Messenger who thereby offered guidance to seekers, but it will always be disputable because not everyone will see the same thing in the Messenger. God purposefully made it difficult although not impossible to recognize the Messenger. Baha’u’llah explained why they appear as ordinary men.
“That the Manifestations of Divine justice, the Day Springs of heavenly grace, have when they appeared amongst men always been destitute of all earthly dominion and shorn of the means of worldly ascendancy, should be attributed to this same principle of separation and distinction which animateth the Divine Purpose. Were the Eternal Essence to manifest all that is latent within Him, were He to shine in the plentitude of His glory, none would be found to question His power or repudiate His truth. Nay, all created things would be so dazzled and thunderstruck by the evidences of His light as to be reduced to utter nothingness. How, then, can the godly be differentiated under such circumstances from the froward?” Gleanings From the Writings of Bahá’u’lláh, pp. 71-72
3) Do you think you are a Messenger of God, thus infallible? If you answer that you are, how do you explain the many mistakes you make in your posts?
Of course I am not a Messenger if God, I am just a fallible human being, and that is why I make mistakes.
Almost as if it doesn't exist and the Messengers are duping people.
No true Messenger of God would have any reason to dupe anyone, only a false messenger would have a motive for such. All true Messengers of God suffered for the sake of God in order to deliver their message to humanity. That is “one way” we know they are true Messengers, we look at the history of their Cause.
“Who can ever believe that this Servant of God hath at any time cherished in His heart a desire for any earthly honor or benefit? The Cause associated with His Name is far above the transitory things of this world. Behold Him, an exile, a victim of tyranny, in this Most Great Prison. His enemies have assailed Him on every side, and will continue to do so till the end of His life. Whatever, therefore, He saith unto you is wholly for the sake of God, that haply the peoples of the earth may cleanse their hearts from the stain of evil desire, may rend its veil asunder, and attain unto the knowledge of the one true God—the most exalted station to which any man can aspire. Their belief or disbelief in My Cause can neither profit nor harm Me. We summon them wholly for the sake of God. He, verily, can afford to dispense with all creatures.” Gleanings From the Writings of Bahá’u’lláh, p. 85
Well this isn't apparent to any objective thinker, so perhaps you're mistaken in your bold claim.
It is readily apparent to Baha’is who think objectively, as they fully understand what it means and why God is the most manifest of the manifest yet the most hidden of the hidden. It only makes sense when you understand why that is the case. That requires study.