"In the thought of Plato, the Idea (especially that of the Good) plays a role at once visible and invisible, unreal and real. Aware of the chimera of the money form and of the power of the Gygean ring to affect even his own thought, Plato responds to the terrifying talisman not with a simple wish that it would return whence it came but rather with an attempt to explain and overcome its power to misinform the mind."
Marc Shell The Economy of Literature (1978) p.41