You know this, how? God spoke to Moses from a burning bush, and from a cloud to John at Jesus's baptism.
So, this is what seeing with new eyes and hearing with new ears is all about. If the person immediately defaults to past ideas, how is it possible to have new eyes and ears. We must be able to look at new concepts with and open mind and use our Gid given reason.
So, both the Bab and Baha'u'llah have offered it was them talking to Moses through the burning Bush. So this is a new concept to consider, how is that possible?
This allows us to consider that Jesus as "Christ is all the Names of God, which are one and all, pre-existant.
There is a Tablet of the Universe by Abdul'baha that explains the emanation/creation of the Holy Spirit from God and shows how all these Messengers are pre-existant and we're sent by God. They are like the suns of our material world that each light a solar system and are part of a Universe of Manifestations.
If you choose, read the first part of this provisional translation.
Remember we are discussing the possibility of seeing with new eyes, and hearing with new ears.