I'd be interested in a more direct reference if you have one.

'For example, self-consciousness is "the concept that consciousness has of itself. Thus in this case concept and referent coincide:... 'self-consciousness' refers to mind's taking on the self-contradictory (and thus also self-negating) role of being subject and object of one and the same act of cognition – simultaneously and in the same respect."'

https://en.wikipedia.org/wiki/Georg_Wilhelm_Friedrich_Hegel#...

The easiest place to start is probably his Encyclopaedia of the Philosophical sciences