Another specific issue concerning the relationship between the human being and the world is the notion of time. Hence, the question to solve in this chapter is how it comes about that human beings experience events in time, i.e. that we experience a progression in time or flow of time. What is it that makes us aware, or at least gives us the illusion that there exists some kind of temporal duration that we call time? What is it that lies behind our, illusionary or not, apprehension, feeling or perception that time flows? Julian Barbour writes, "[n]othing is more mysterious and elusive than time" (Barbour 2000: 11). Earlier St. Augustine (354–430) argued that time has no reality; it is only something that humans apprehend. Time cannot be infinite either, because God created it and everything that God created is conditioned. Indeed, human beings "live" time but cannot really explain it. There are different ways in which people have perceived and still perceive time, of which some are very specific.