Also known as Atman, this is what you are. You are the rider or pilot of the vehicle you occupy. Normally if you are reading this, that will be a human body, more or less.
What the Roman Catholic church defines as "original sin". The sin is confusing your identity as the vehicle, not the rider or soul of the body. Reassuringly, nearly everyone, with a soul, suffers from this sin at some time or another. Humans without a rider are not the concern of the church except to eradicate or to convert, which may infuse a soul. But don't hold your breath. It is not known how many humans if any, lack the Atman or higher self.
Most human ills arise from the misidentification of the rider, an immortal, with the vehicle. I am hungry. I have pain. I cannot......whatever. Yes you can. Even if it costs you your current vehicle, you can.