 This “captain spirit”, determines the moral constitution of the creature, and its continuous identity across time, throughout the metamorphoses which the creature undergoes. Another limit on creaturely change is that an individual creature cannot transform into another individual (Peter cannot become Paul, or Judas). The reason for this rests with divine justice: it would be unjust for Peter to be rewarded for Paul’s righteousness, or for Peter to be punished for the sins of Judas.