All of existence is divided into three classes. What is completely, what is in no way, and what both is and is not. What is completely, can be completely known. What both is and is not is opinion or conjecture; everything else is ignorance. True philosophers seek the real, unchanging knowledge of truth in the Forms, the ideal abstracts ideas of Truth, Beauty and Justice, and other concepts, which we experience only in pale copies of the ideal Form. The philosopher alone has knowledge of the Idea of Absolute Beauty, or the Idea of Absolute Truth, that is, the Forms.