Duration, Singularity, Existentialism

The common association of the concept of Duration with that of flux has tended to overshadow the primary theme of the context in which Bergson first presents it--Free Will.  For sure, the concept of Time as a continuum does undermine the Mechanical Causality that constitutes standard Determinism.  But, also, that Causality is usually formulated as a law, in which case its instances are also instances of some general law, e. g. physical, behavioral, etc.  So, Bergson's insight is that Free Will entails temporal singularity, a characteristic of experience that can also be conceived as signifying a variation of Existentialism, in the proper sense of the term, i. e. as connoting 'not an instance of a human Essence'.