Thinking
Hegel (throughout)
The activity of the concept's self-determination. Thinking is not mere representation but the performative enactment of the fundamental logical operations. It is the movement in which the subject grasps the structures of reality and comprehends itself within them (Chap. 9.2).
Origin
Concept; Logic; Method; Fundamental operations, four; Understanding vs. Reason
In Hegel
Enc. §19–25 (positions of thought)