 Since the critique of reason is a continuous, progressive, and reflexive process, reason exhibits a history, which coincides with the development of practices of tolerance and mutual recognition (O’Neill 1999: 174, 2002). Such practices establish the authority of reason. This ‘developmental’ view of practical reason and of its autonomy accounts for change and progress. Arguably, this is a significant explanatory advantage over competing views, which do not fully appreciate the historical and dialectical dimension of truth and reason (O’Neill 1989b: 70–71; Arruda 2016). As we shall see in  section 6,  it requires the constructivist to provide an account of truth and objective knowledge as altering in time.