Selection from Plato's Dialogue “Phaedo,” Part 1 of 2

And he attains to the purest knowledge of them who goes to each with the mind alone, not introducing or intruding in the act of thought sight or any other sense together with reason, but with the very light of the mind in her own clearness searches into the very truth of each; he who has got rid, as far as he can, of eyes and ears and, so to speak, of the whole body, these being in his opinion distracting elements which when they infect the soul hinder her from acquiring truth and knowledge-who, if not he, is likely to attain the knowledge of true being? What you say has a wonderful truth in it, Socrates, replied Simmias.