 It will be useful to untangle a couple of ideas that are confounded in these quotes from Smart, with the help of some arguments of (mostly) Broad’s (1938, section 1.22 of Chapter 35). First is the idea that time “flows” or, more generally, that passage is somehow to be thought of as like motion. Perhaps time itself somehow moves. Or perhaps, as Broad wrote in a famous passage (1923, 59):