You have not read my earlier reply. Anyway I will post again here for your convenience.

Prophet and Incarnation ... (Excerpt from message of Shri Datta Swami)

When a person says that He was sent by God as a messenger and that He has brought the message of the Lord, the following problem appears. When God is giving the message to that person, nobody has seen it. That person is the single witness. Now the only alternative left in order to believe that the Lord Himself gave the knowledge, is that we have to test the knowledge.

Had we seen the transfer of the knowledge from God to that person with our eyes, we need not have tested that knowledge. It must definitely have been divine knowledge. If we have to believe a statement of that person without the simultaneous universal perception, then we have to believe even a fraud person who utters the same statement.

If you give us a piece of metal and say that is gold, since God gave it, we cannot believe it. Either we must have seen God giving it to you or we must analyze the metal. Moreover the knowledge is not like the piece of metal, which will not change by transfer. When a teacher explains a concept to somebody and asks him to deliver it to his students, it cannot be transferred as it is.

The transfer of knowledge consists of not only the concept but also the explanation. The concept might have been transferred but nobody other than that original teacher can give the same way of explanation of the concept by which the concept pierces into the heart. Therefore to propagate the divine knowledge, the Lord Himself comes down in a human form. Arjuna said the same in the Gita “Tvadanyah…” which means that except the Lord, nobody can preach the divine knowledge and clarify all spiritual doubts.