Do you think you could be content with one proof?
This extract from the Kitab-i-iqan by Baha'u'llah first addresses why we reject a Messenger
"...It is evident that the changes brought about in every Dispensation constitute the dark clouds that intervene between the eye of man’s understanding and the divine Luminary which shineth forth from the dayspring of the divine Essence. Consider how men for generations have been blindly imitating their fathers, and have been trained according to such ways and manners as have been laid down by the dictates of their Faith. Were these men, therefore, to discover suddenly that a Man, Who hath been living in their midst, Who, with respect to every human limitation, hath been their equal, had risen to abolish every established principle imposed by their Faith—principles by which for centuries they have been disciplined, and every opposer and denier of which they have come to regard as infidel, profligate and wicked—they would of a certainty be veiled and hindered from acknowledging His truth.…"
Then He adds that the darkest veils become the teachings and traditions
"....It behooveth us, therefore, to make the utmost endeavor, that, by God’s invisible assistance, these dark veils, these clouds of Heaven-sent trials, may not hinder us from beholding the beauty of His shining Countenance, and that we may recognize Him only by His own Self..."
It is the Self of the Messengers that become the greatest way we can recognise God.
".....And should we ask for a testimony of His truth, we should content ourselves with one, and only one, that thereby we may attain unto Him Who is the Fountainhead of infinite grace, and in Whose presence all the world’s abundance fadeth into nothingness, that we may cease to cavil at Him every day and to cleave unto our own idle fancy...." — The Kitáb-i-Íqán
That is the OP, it appears if we want proof, then we should ask of only One and be content with it.
Would One proof be sufficient for you?
