Full Idea
Rather than a sentence being used for prediction because it is a law, it is called a law because it is used for prediction.
Gist of Idea
We don't use laws to make predictions, we call things laws if we make predictions with them
Source
Nelson Goodman (Fact, Fiction and Forecast (4th ed) [1954], p.21), quoted by Stathis Psillos - Causation and Explanation §5.4
Book Reference
Psillos,Stathis: 'Causation and Explanation' [Acumen 2002], p.142
A Reaction
This smacks of dodgy pragmatism, and sounds deeply wrong. The perception of a law has to be prior to making the prediction. Why do we make the prediction, if we haven't spotted a law. Goodman is mesmerised by language instead of reality.