Plato deliberately did not put some of his teachings into writing and only taught them orally, because he found written text unfit for the purpose. https://en.

Plato deliberately did not put some of his teachings into writing and only taught them orally, because he found written text unfit for the purpose. https://en.wikipedia.org/wiki/Plato%27s_unwritten_doctrines https://en.wikipedia.org/wiki/Plato%27s_unwritten_doctrines