> In a relevant sense, common occurrence of a pattern reveals a weakness in the language where it appears, because no one has succeeded in capturing it in a lib

> In a relevant sense, common occurrence of a pattern reveals a weakness in the language where it appears, because no one has succeeded in capturing it in a library so it doesn't need to be coded again. Correct but also a tired point. This is stated in the intro to the design patterns book: these things that we are about to explain are “patterns” because the languages we use can’t express them directly.