Full Idea
Since intelligence is intelligible for intelligence, intelligence is its own object. ...Intelligence, therefore, is simultaneously thinker and thought, all that thinks and all that is thought.
Gist of Idea
Intelligence is aware of itself, so the intelligence is both the thinker and the thought
Source
Porphyry (Launching Points to the Realm of the Mind [c.280], 5Enn3 32(5-7))
Book Reference
Porphyry: 'Launching Points to the Realm of the Mind', ed/tr. Guthrie,Kenneth [Phanes 1988], p.48
A Reaction
This is a bit of a problem for Descartes, if the Cogito is taken as offering evidence (thought) for the existence of a thinker ('I'). Porphyry implies that the separation Descartes requires is impossible.
Related Idea
Idea 2259 "I am, I exist" is necessarily true every time I utter it or conceive it in my mind [Descartes]