  (In another typescript from the same period (Prior n.d.b) he wrote that ‘our choices are pre-determined’ but that ‘it is in our power to find out what the forces are which determine our choices, and even to exercise some control over them (while, of course, being in this very exercise “controlled” by other forces which do not worry us). Prior’s (n.d.b) is discussed in detail in Hasle (1999) and (2012).)