This proposition has already been shown to be invalid. The hippocampus' autoassociative function demonstrates that self-reversion can be wholly corporeal. Episodic memory, being as we've seen both corporeal and self-reversive, appears to be inseparable from the body. It follows that self-knowledge, being the memory with self as both subject and object, must likewise be inseparable from the body. The entanglement makes self-knowledge a hostage to the body's corporeal limitations.
Every soul is indestructible and imperishable .
The soul would appear to be intimately dependent upon self-knowledge and the greater store of memory. This is a dour conclusion. It is also not new. Scientific knowledge supports the conclusion today, but even in the classical and medieval worlds complete mortality appeared occasionally as a minority position. The works of Plato, Aristotle and al-Farabi provide famous examples.