Materialists believe that material entities exhaust the nature of reality.  This commits them to believing there is a material/physical cause for every physical effect.  Indeed, on a materialistic worldview physical causes determine a physical effect.  If material cause X is present, material effect Y must occur.  Just like falling dominos, when one domino falls on another, the second domino must fall.  There are many things, however, that cannot be explained in terms of material causes.  Consider communication.  When your friend speaks to you, you will respond in kind.  How can this be explained in terms of deterministic, material causation?  How can his words cause you to respond—yea, even determine your response?  Did his words produce molecular changes in the space between you, which in turn caused physical changes in your body that ultimately determined that you say X (as opposed to Y or Z) in response?  While this seems incredulous on its face, let’s grant that it is possible for the sake of argument since there are other forms of communication that are even more difficult to explain from a materialist perspective.

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