Making extensive use of the voluminous secondary literature on his authors, Nyvlt tries to avoid broad strokes and boldly strides into the scholarly controversies concerning his historical study, such as whether the testimonies to Plato's Unwritten Doctrines
are unreliable, whether the Unmoved Mover knows the world, and whether Plotinus conceives of the emanation of all things as due to an internal conversion of the One to itself.
Despite this, she doubts that Plato is esoteric, although she discusses at some length the question of his unwritten doctrines
about the Good.
Finally, no article squarely addresses two difficulties regarding Plato's unwritten doctrines that were raised back in 1945 by Harold Chemiss.
The first argues that Plato's account of the Good in the Republic defies interpretation unless it is contextualized within the reports of the unwritten doctrines and the metaphysical discussions of Plato's day.
Gaiser closely examines the accounts of mathematics in Plato's works and in Epinomis and only brings in the unwritten doctrines as supporting evidence (though perhaps Gaiser's conclusions are already determined by them).
It is obvious, he argues, that the theory of principles of Plato's unwritten doctrines
is not identical with what Republic 6 and 7 say about the good, but there is no real opposition.
Gaiser, and others, Canto pays no attention to Plato's unwritten doctrines
Their exegetical reading of Plato attempted to take into account the so-called Unwritten Doctrines of Plato on the Protology or Theory of the Principles without neglecting the dialogues themselves.
So it comes as no surprise to have Reale devote time and attention in volume one (introductory essay) to Aristotle's testimony in regard to the Unwritten Doctrines as found in the Metaphysics.
and the question concerning the esoteric Plato (Does the Philebus reveal Plato's unwritten doctrines
, especially those about the Good?