"If we examine objects more thoroughly with intelligent insight, then we partake of the eternal in them. But the physical senses do not convey to us the eternal in its true form. They deceive us when we rely implicitly upon them. They cease to deceive us if we confront them with logical insight, making everything conveyed by the senses subject to examination by this insight. But if logical insight is to judge the statements of the senses, must not something live within this insight which transcends the perceptions of the senses? Hence what is true and false in objects is judged by something in us which opposes the material body, and therefore is not subject to its laws. Above all, this something must not be subjected to the laws of growth and decay, for it bears truth within itself. Truth cannot have a yesterday and a tomorrow; it cannot be this on one occasion and that on another, as material things are. Hence truth in itself must be eternal. As the philosopher turns away from the transitory material world, and turns to truth, he approaches an eternal element, dwelling within him. If we immerse ourselves wholly in the spirit, then we live entirely in truth. The material world around us is no longer present in its material form only. "Would not that man," asks Socrates, "do this most perfectly who approaches each thing, so far as possible, with the reason alone, not introducing sight into his reasoning nor dragging in any of the other senses along with his thinking, but who employs pure, absolute reason in his attempt to search out the pure, absolute essence of things, and who removes himself, so far as possible, from eyes and ears, and, in a word, from his whole body because he feels that its companionship disturbs the soul and hinders it from attaining truth and wisdom? ... Well, then, this that we call death, is it not a release and separation from the body? But, as we hold, the true philosophers and they alone are always most eager to release the soul, and just this--the release and separation of the soul from the body--is their study."
Rudolf Steiner, Plato as a Mystic