Primary sources are for beginners
There is a bizarre assumption that primary sources are for the experts while students need the easier, more accessible stuff of secondary literature. But the truth is exactly the reverse. Anybody can read Augustine’s Confessions or Julian of Norwich’s Revelations – but it takes an expert to appreciate a judicious scholarly survey. That is why publishers struggle to sell copies of their Introductions and Guides, while Augustine and Julian of Norwich have never gone out of print, and never will until the end of the world.