Why is so much of New Testament doctrine revealed through the use of occasional letters?

Question

Instead of in systematic books written, authorized, and canonized specifically to define Christian doctrine? Why didn't God deliver these himself, as he did the Law to Moses? Maybe this explains why the Old Testament Law has more clarity than the New Testament doctrines. Why did God leave the writing of systematic theologies to modern, uninspired writers, who cannot agree with one another?

Answer 1

True, and it is what I've been saying all along. When I was a Christian, I still didn't believe in the letters of Paul. Was it not the prophets of the ancient times that brought laws and the word of G-d through revelation (ie. a burning bush, the direct voice of G-d)? Then years later, the "new" testament is revealed through letters and secondary sources written by people who weren't even there. Another great point, thanks for the question.

Answer 2

This is a good question, I for one can not answer it because I am not at all into the politics of the bible... this is a hard question lol, but thxs you have prompted me to do some research.