Here’s a clip I once wrote about the origins of Self-Reference in Classical Logic:
‘In looking for ‘Nothing’, you must remember to exclude any sensory, cognitive or affective representation of it as Object. ‘Nothing’ is radically exclusive.
In looking for ‘Everything’, you must remember to include the Looking-Subject. ‘Everything’ is radically inclusive.
The Symbol ‘0’, the original Self-Negating Expression, is a synthetic construct that was put together with the very specific objective of helping the investigator get to the bottom of all this.
In particular, this ‘I’.