Can someone translate this Chinese calligraphy into English?
Main text:


  一日不讀書口中生荊棘
  
  Thorns will grow in your mouth if you go one day without reading/studying.
  
  (하루라도 책을 읽지 않으면 입속에 가시가 돋는다)


The rest:


  庚戌三月 扵旅順獄中 大韓國人 安重根 書
  
  Third month of 庚戌 (1910), Imprisoned at Port Arthur, (written by) Ahn Jung-Geun, Citizen of the Korean Empire.