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  What it means

  Literally: “What little Jaś does not learn, Jan will not know.” Jaś is the childhood form of Jan, while Jan is the adult name. The saying means that what a person misses in youth is hard to learn later. Habits, knowledge, and character formed in childhood often stay for life. It stresses teaching children well instead of 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

  The contrast between Jaś and Jan shows the move from childhood to adulthood. Teachers, parents, and grandparents often quote it when talking about early learning. It is a familiar saying about childhood as the base for adult skills.

  Intermediate

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