Secondly, you need to realize that "absolute truth" itself is relative to its observer, and that it doesn't describe reality (the universe as it is with everything in it) unless you stipulate "absolute truth" to mean reality. However, defining reality and all that is in it will not answer "why?" questions, only "how?" Therefore, defining "absolute truth" is silly and shows the height of philosophical ignorance, especially considering that this is a question philosophers (people far more qualified and intelligent than anybody on this thread) have attempted to answer for millenia.
Why can we never answer this question? Because it is entirely contingent upon human perception, and any being (save an all knowing God that resides outside of the material universe, who himself is a human construct) humans can possibly conceive. Therefore, philosophy will always be limited due to human perception.
It disgusts me that you people are actually allowed to discuss Nietzsche or these cliched questions.
Do you believe that the next Martin Heidegger resides on this forum? I know that he doesn't, as it isn't me, so how could he?