Hi Kavyareddy2,
Welcome to the forum.

Seth talks about changing the past in several different places across his various books and sessions. In the spoilers below, I’ve listed some of the things that he’s said about this topic (click on each of the spoilers below and they will open).
Some of us here use a kind of shorthand to define the location where Seth specifically talks about a topic in a specific Seth book, chapter and session number. For example, SS, Ch16, S566, refers to “Seth Speaks”, Chapter 16, Session 566; TES1 = “The Early Sessions”, Book 1, and DEaVF1 = Dreams, Evolution and Value Fulfillment, Book 1.
Not only does Seth strongly indicate that we can and do change our past in the first 3 spoilers below, he also gives us an example of this in the fourth spoiler in regards to how Rob’s mother changed her past, after her husband (Rob’s father) died.
Can people actually change their past? My personal belief is Yes, they can, but there are some caveats that come along this, as Seth explains in the second spoiler below; others can choose to either accept or reject your version.
About 2 years ago, my sister and I were talking about an event that we both participated in together, many years ago when we were both teenagers. Surprisingly to both of us, her memory of the event and mine were very different, in some specific places. In some places they were completely incompatible. We were both completely surprised and stumped by this. Neither one of us has any health issues or memory problems that could account for this.
My only explanation for this, is that perhaps at some point, one of us or maybe both of us either changed our past, or changed our belief about what happened in the past (perhaps this is the same thing). For me, it’s not only what Seth says here about changing your past, that makes me think that we can actually change our past, but it’s also this personal experience that I had with my sister.
I’ve never actually consciously tried to change my past, but I suspect that it can be done. Largely, like a lot of the things that Seth says in NOPR "Nature of Personal Reality”, about belief, I also suspect that belief plays heavily into this. That is, if you “don’t” believe that you can do this, then you probably won’t be able to.
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-jbseth