This is one of my favorite songs of theirs. To me, the song is saying how society in the world shapes and molds people from a young age into something that they want. You can't really know if the things that you think are actually your free thoughts or if they're just thoughts reflected upon what you see in the world. By living here on earth, you're brainwashed the moment you're born so you never really have time to think or over-analyze the things that we humans do. Life sometimes seems as if it's just a long process of functioning, what is to be believed, correctly.