The Gospels as the Holy Ghost
Christianity spread in Roman cities in the first and second centuries at a raid pace.
Christianity at the time taught that the end of the world was coming soon. However, the world seemed to continue in the Roman Empire. Probably, many Roman believers must have thought that Christ Jesus referred to the Jewish Roman war where Judaists were expelled out of Jerusalem and Palestine. The world based on the Jewish holy book was over. Now, the new world must have begun with the teaching of Christ Jesus. They must have thought so.
Church leaders used Gospels to teach what Christ Jesus had done in Palestine, but they put emphasis in their teaching, which must have been their interpretation of the teaching of Christ Jesus. But most of Roman people who came to churches or Christian assemblies must have been interested in who and what Christ Jesus was more than teaching of church leaders. They must have found the answer in the Gospels. There must have been many Roman citizens who could read the Gospels written in Greek. The ratio of those who could read the Gospels in the Roman Empire must have been more than that in the Middle Ages of Europe.
That is why the Gospels came to be respected by ordinary people while church leaders did not count on them so much. Church leaders must have discovered the power of the Gospels. That is why the Christian church system did not specify canonical books from the beginning of their preaching since the late 1st century in Roman cities, but adopted the Gospels as authentic in the fourth century.
But they had to tell that Christianity prevailed without help from the Gospels. So, they thought that the holy ghost helped their mission among Roman citizens. Early church leaders could not simply or candidly admit that the Gospels helped diffusion of Christianity. But they wanted to declare that their work supported by the holy ghost helped them preaching. Accordingly, they introduced the Holy Ghost in the Trinity.
So, it is not unnatural for people of today to think that the Holy Ghost in the Trinity means the Gospels according to Mark, Luke, Mathew and John.
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Mar 11:20 And in the morning, as they passed by, they saw the fig tree dried up from the roots.
Mar 11:21 And Peter calling to remembrance saith unto him, Master, behold, the fig tree which thou cursedst is withered away.
Mar 11:22 And Jesus answering saith unto them, Have faith in God.