You see it in the fact that people like Plato and his descendants when they talk about beauty, goodness, truth and all that as being pre-existent Forms, from which they derive a metaphysical rational-idealist theory of objective morality, but have no interest in theia mania.
And that's a problem because Plato sees divine madness as the best form of access perceiving the divine world, which pre-exists the material cosmos, and describes four kinds of madness given by the gods. So it's taking up the rationalism of Platonism, but not its real heart.