Human beings have the innate capacity to walk spiritually on their own feet. But that capacity has to be actualized. Until this actualization takes place, they need walking aids, like children who need walking aids until they walk on their own.
I would say, Human beings have certain potential gems in them, which for these gems of inner being to be discovered within, "education" is required.
There is no better educator than God, for He is the One who created it, and He is the one who trains it. Thus this education must come from the knowledge of God to ensure infallibility.
Since no man has access to the knowledge of God directly, God has been appointing Divine Prophets among people, who are His Perfect Mirrors, whose knowledge are identical to God, and they reflect the Words and Will of God into world, like a perfect Mirror. Thus they are the best source of this education for training humanity.
However, these teachings that came through Prophets, tend to get faded and distorted and forgotten and misinterpreted, when the message is passed through generations, therefore once in every while, a New Divine Prophet is appointed to bring back that original teaching, correct the misinterpretations.
Moreover, as time passes and humanity goes from one Age to another Age, both the level of understanding of humanity, as well as the Problems of the Time changes, thus God will reveal from time to time His new teachings which are in accordance to the exigencies of the time.
Like, the Prophets before Jesus had prophesied in their Laws that a Messiah must come, and those prophecies were fulfilled in the Person of Jesus.
Although those Prophecies are subjected to interpretation, and many can argue that those prophecies are not fulfilled by Jesus (should you investigate various views on those prophecies).
However Jesus, also Prophesied of another One after Himself with these words:
"I have much more to say to you, more than you can now bear. But when he, the Spirit of truth, comes, he will guide you into all the truth. He will not speak on his own; he will speak only what he hears, and he will tell you what is yet to come." John 16:13
This spirit of Truth, is a Divine Prophet, who is the embodiment of the holy spirit, for the scripture says He has ear to hear and a tongue to speak.
"For the Son of Man is going to come in his Father's glory with his angels, and then he will reward each person according to what they have done. "Truly I tell you, some who are standing here will not taste death before they see the Son of Man coming in his kingdom."" Matthew 16:27-28
In these words, Jesus was talking about another prophet, referring to him as "son of man" and "He". And the reason that the New Prophet is required is because, the Christian Faith and other people have been divided to many denominations, and that truth that previous prophets had given is misinterpreted in many ways, and that truth is divided. Moreover a new Age has come, with its own problems, and therefor a new guidance is required from God. For example how can the whole humanity become united and all wars go away? Obviously these topics would not be solved on human alone, but the guidance of God is required.
Jesus likewise prophesied of His own return. So, as long as it is related to the Topic of this Thread, do you believe that return is the Physical return of Jesus, or the return of the same spiritual power and quality in a new person?
How did Elijah returned as John the Baptist?