Philosophers who work on time often ignore the implications their doctrines have for the common sense intuition that the past is fixed and the future not. Similarly, those who work on fatalism, and whose arguments often imply an assertion or denial of the common sense intuition, rarely take into account the implicit dependence their arguments have upon specific theories of time. I take the intuition, and its relation to the nature of time, seriously. In Part I of my thesis, I investigate the relations between the dynamic and static theories of time, on the one hand, and the intuition, on the other. I argue that the so called 'pure' forms of these theories, inasmuch as they both posit an ontological temporal symmetry, cannot do justice to th...