The traditional goal of philosophy, considered to be some amalgam of knowledge, spiritual profundity, Stoical ability to put up with the evils of the world, and practical ability or phronēsis. The myth of the cave recognizes the difficulty the wise man or philosopher will have in communicating his understanding to those who remain in the cave; the central problem with wisdom is that those who do not have it will be unable to distinguish those who do from false claimants and pretenders. This is particularly so when wisdom is equated with the incommunicable, ineffable contact with a higher world than this one. The so-called wisdom literature of the Bible includes the books Job, Ecclesiastes, Proverbs and the Song of Solomon.