ase "Beauty is truth, truth beauty," no one can say for sure who "speaks" the conclusion, "that is all / Ye know on earth, and all ye need to know"; it could be the speaker addressing the urn, and it could be the urn addressing mankind. If it is the speaker addressing the urn, then it would seem to indicate his awareness of its limitations: the urn may not need to know anything beyond the equation of beauty and truth, but the complications of human life make it impossible for such a simple and self-contained phrase to express sufficiently anything about necessary human knowledge. If it is the urn addressing mankind, then the phrase has rather the weight of an important lesson, as though beyond all the complications of human life, all human beings need to know on earth is that beauty and truth are one and the same. Which reading to accept is largely a matter of personal interpretation....