Does the famous “Divided Line” at the end of Book VI of the Republic express the truth of things? Yes, and most profoundly. Plato’s understanding can be summed up by the word participation. Everything that exists participates in being. What this means is that nothing that exists is the fullness of being, is perfectly self-sufficient, is self-grounded. Everything is and is not, in some respect and to some extent. That which is not subject to these limitations and contingency doesn’t exist, as a being, but is being itself, so to speak, or as Plato puts it in Book VI, is “beyond being.” It does not participate, but is that which is participated.