The past is always changing.
We look at it from the present and from where we look is the same as what we see. Two sides of the same coin. Perceiving is creation. So how could the past not change? We are constantly in creation of the past, even the very distant past. The past is now. Perceived now as an idea of something past, in time.
So Im in no way bound to my past. My past changes as I transform. There is no lag or immovability about it. All is up for transformation every moment, all times, past, present and future. Its one moment, ever changing. From where I see it determines the qualities attached to it. So purify myself in the most rewarding fashion and realize there is no thing that is fixed. Nothing.