Full Idea
True knowledge is concerned with the abode of true reality, without colour or shape, intangible but utterly real, apprehensible only to the intellect.
Gist of Idea
True knowledge is of the reality behind sense experience
Source
Plato (Phaedrus [c.368 BCE], 247c)
Book Reference
Plato: 'Phaedrus and Letters VII and VIII', ed/tr. Hamilton,Walter [Penguin 1973], p.52