Full Idea
For Schopenhauer concepts are abstractions from perception, what he calls 'representations of representations', and are linked to the creation of language.
Gist of Idea
Concepts are abstracted from perceptions
Source
report of Arthur Schopenhauer (Fourfold Root of Princ of Sufficient Reason [1813]) by Peter B. Lewis - Schopenhauer 3
Book Reference
Lewis, Peter B.: 'Schopenhauer' [Reaktion Books 2012], p.74
A Reaction
This is a traditional view which dates back to Aristotle, and which I personally think is entirely correct. These days I am in minority on that. This idea means that (contrary to Kant) perception is not conceptual.