You’ve got to do your own growing, no matter how tall your grandfather was.

The image is deliberately homely and physical: no matter how “tall” (distinguished, successful, admirable) one’s grandfather was, that inherited height does not make the descendant grow. The saying argues that identity and achievement are not transferable; lineage may provide advantages, but it cannot do the inner work of learning, discipline, moral formation, or resilience. It also gently punctures pride in ancestry, warning against living on reflected glory. In a broader sense, it champions agency: growth—whether education, skill, or character—requires personal effort and cannot be outsourced to family history, tradition, or reputation.