Lyric discussion by insideoutcast 

Silent noise is ignorance. By firmly believing in one system of thought at the expense of all others closes doors that may lead to a more ultimate truth. It also creates contention with opposing points of view. By closing the mind to alternative points of view, in essence mankind regresses and crawls back into the primordial ooze. Ignorance breeds intolerance. Fear and doubt breed hated and righteousness. Hardset Head is a reference to stubbornness and narrow-mindedness.

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