Have you given any thought into rewiring the mind to think in a different way?

Before books became common people couldn't read inside of their heads. What I am saying what if it was possible to train your brain to think in a completely different way. For example what if we pretended to have conversations with someone like a therapist and then gave each of us advice. Would in time another voice arise in our minds that we had control of. Sort of like a completely different person yet the same one. What if we could have more than two voices in our minds that we are in control of. Another way of achieving that would be to have conversations that you will have in the future and just have them in your head before hand. Maybe by doing these enough you can develop another voice someone like a therapist someone to help you in your time of need. Any ways these are just ideas. If any of you have any ideas like these please let me know and give your opinion and any insight on this matter.