My theory, based on the FACT that this is my soul's 17,043rd incarnation, and that that is not even close to a vast number, and given the reality of the science in this reality that homo sapien sapiens have only existed as a species for 200k or so years, is that I believe that souls are time travelers in that we can choose to improv-script our masterclasses at any point in time. I do not believe an already-lived-life has to have taken place in the past nor that a yet-to-be-lived life has to take place in the future. I do not believe that the paradoxes of time-line crossing as discussed in science fiction present an issue. Each chosen setting is an alternate reality.