Full Idea
Having a concept is not recognizing a feature of experience; the mind makes concepts. We then fit our concepts to experience.
Gist of Idea
The mind does not lift concepts from experience; it creates them, and then applies them
Source
Peter Geach (Mental Acts: their content and their objects [1957], §11)
Book Reference
Geach,Peter: 'Mental Acts: Their content and their objects' [RKP 1971], p.40
A Reaction
This seems to imply that we create concepts ex nihilo, which is a rather worse theory than saying that we abstract them from multiple (and multi-level) experiences. That minds create concepts is a truism. How do we do it?