Bergson presents his idea of duration which is less of a concept than a real lived sense that is happening in your life right at this moment. But at first he introduces the reader the intensities of psychic states such as beauty, grace, joy, sorrow, pain and how a misinterpretation of real lived experience gives rise to a way of philosophy which separates real duration as it is experienced into space-like time. Bergson explains the falseness of the specialization of time which unavoidably leads to the paradoxes of Zeno in ancient days and determinism with its lack of human freedom. He overcomes the usual arguments of determinism by simply just not defining freedom or its prior conditions since this would once again introduce determinism and specialize duration. Seems like the author lives his work, and makes everything to make it alive for readers. It is less an argument than a movement through your own feelings and intuitions which then allow you to understand what he is saying, it isn't difficult concepts you can't wrap yourself round. Sometimes it’s quite difficult to understand Bergson (well, just like it happens with works of other philosophers), but this is an enjoyable reading.