The lessons can be seen as propaganda. Heck, they could easily brainwash the layman. Well, it's not brainwash in the truest sense of the word, given that most of the things Vivec talks about in the Lessons happened. The Nerevarine was, say, an insider to the whole business and could understand them better.

I visited the House of Curiosities in Windhelm and came to the conclusion that Ysgramor was no other than Chuck Norris, since he could eat soup with a fork. The Hands couldn't stand a chance against his minions.