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  What it means

  Literally: “What little Jaś does not learn, Jan will not know.” The proverb contrasts the childhood nickname Jaś (a diminutive of Jan) with the adult name Jan to emphasise that what a person fails to absorb in youth cannot be easily recovered later. It expresses the belief that early education and upbringing are decisive — habits, knowledge, and character formed in childhood tend to persist for life. Poles use it to stress the importance of teaching children well and not leaving learning until adulthood.

  English equivalent

  You can't teach an old dog new tricks.

  Vocabulary

  • czego — what (genitive of 'co', used after negation)
  • się — reflexive particle (here used with 'nauczyć się' — to learn)
  • Jaś — Jaś — diminutive/affectionate form of Jan (John), representing a child
  • nie nauczy — will not learn (perfective future of 'nauczyć się')
  • Jan — Jan — the adult form of the same name, representing a grown man
  • nie będzie umiał — will not know / will not be able to (future of 'umieć')

  Grammar note

  The subject of the first clause is the understood 'Jaś' with the reflexive verb 'nauczyć się' (perfective, meaning to learn/acquire knowledge). 'Czego' is the genitive form of 'co' required by negation — in Polish, a direct object in a negative sentence normally shifts to the genitive case. The second clause uses the compound future 'będzie umiał' (imperfective) rather than a perfective form, highlighting an ongoing inability rather than a single event.

  Cultural context

  Using the diminutive Jaś versus the formal Jan is a deliberate rhetorical device: the contrast between the nicknames themselves narrates the passage from childhood to adulthood. The proverb is a staple of Polish parenting discourse and is often quoted by teachers and grandparents. It reflects a broader Central European emphasis on formal early education as the foundation of adult capability.

  Intermediate

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