Maybe an historical analysis on why the content of the tipitaka is the actual teachings of the Buddha.
I discussed with some people and one of them told me nothing of what the Buddha said was written down until at last 500 years after his death, so it's merely creative imagination to report what he "said" about anything. In fact, throughout history what is attributed to the Buddha is basically just the views of one monk writer or another framed as the words of the Buddha so as to assume authority. Yes, of course such writings have constituted Buddhism, but it would be naive to imagine that writers were quoting the Buddha's exact words hundreds of years later.
This is in the context of a discussion where he said there was historical evidence of monks working as fortune tellers in traditional buddhist countries like Burma, thailand, etc.
I told him such things were seen as animal arts by the Buddha as it is clearly evidenced in DN 2.