書到用時方恨少 [书－－时－－－]

Jyutping syu1 dou3 jung6 si4 fong1 han6 siu2
Pinyin shū dào yòng shí fāng hèn shǎo

Definitions (CC-CANTO)
  1. to regret not having studied harder in the past and only realising now that you need to use that knowledge
Definitions (粵典–words.hk)
  1. 語句
    到​知識用​得​著​嘅​時​候​，​先會​發覺​自己​學得​唔​夠多
    to regret learning too little when in need of applying one's knowledge
Definitions (Wiktionary)
  1. proverb
    It is only when it comes time to apply knowledge that you regret not acquiring enough of it.
Examples (粵典–words.hk)
  1. Cantonese
    书到用时方恨少
    書到用時方恨少
    syu1 dou3 jung6 si4 fong1 han6 siu2
    • to regret learning too little when in need of applying one's knowledge
Examples (Wiktionary)
  1. Mandarin
    书到用时方恨少
    書到用時方恨少
    shū dào yòng shí fāng hèn shào
    • to regret not acquiring enough knowledge only when it comes time to apply it