What makes you think you understand "the source"?
Evangelicals might not put much stock in the great Church doctors and theologians. But most Christians throughout history -- Catholics, Orthodox, and even many mainline Protestants -- appreciate the Biblical insights of the great minds who've spent their lives in religious study.
"But when He, the Spirit of truth, comes, He will guide you into all the truth; for He will not speak on His own, but whatever He hears, He will speak; and He will disclose to you what is to come."
- Jesus
You did not have to be a theologian to understand what Christ was saying. He was talking to fishermen and common people.