> If there is no single principle that unites them, then there is no single, unchanging person having them. If there is no unchanging person having the thoughts

> If there is no single principle that unites them, then there is no single, unchanging person having them. If there is no unchanging person having the thoughts, then there is no connection between the thoughts. I don't think either of these implications obviously holds, except possibly by idiosyncratic definition in the first case. (Surely nobody thinks a person having thoughts is unchanged by them, or else we'd all just be static.)