Deuteronomy 32:2 King James Version (KJV) Give ear, O ye heavens, and I will speak; and hear, O earth, the words of my mouth. My doctrine shall drop as the rain, my speech shall distil as the dew, as the small rain upon the tender herb, and as the showers upon the grass:
The first doctrine came by men who listened to God and spoke the words they were given. The first five books of the bible are words given to Moses to record for our posterity. Other men dedicated to God became the voices where early believers received instruction, teaching, doctrine indirectly from God because Godly men had a personal relationship with God.
It was not until Christ came into the world and spoke to all mankind that the multitudes heard directly from God.
Hebrews 1:1-3a King James Version (KJV) God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds; Who being the brightness of his glory, and the express image of his person, and upholding all things by the word of his power.
This is why the words of Jesus are so important. Those who place their faith in the atoning works of Christ can hear directly from God without the need for a prophet or a teacher or a pastor.
Given that the word in the bible is logos there is a connection between the written word and the revealed mind of God. He is speaking truth to us by the power of the Holy Spirit who is given to teach us all the things that Jesus has said.
Continued tomorrow.