This document discusses the importance of learning programming languages over frameworks. It argues that frameworks reflect the opinions of their underlying languages, and languages with fewer opinions give users more flexibility. The document uses Groovy and Grails to illustrate how language evolution influences framework evolution. It provides examples of how Groovy leverages concepts like static typing, meta-programming, domain-specific languages, and inheritance vs. composition to increase productivity. The key message is that frameworks enable productivity but learning languages unleashes more potential for innovation.