Following are a number of back-translations as well as a sample translation for translators of Jeremiah 4:18:

• Kupsabiny: “‘Judah, you alone have brought this upon yourself because of how you live with your deeds/actions. Your sin brought this suffering to you. It has pierced your heart like a spear.’” (Source: Kupsabiny Back Translation)
• Hiligaynon: “Your (plur.) very-own conduct and behavior were- the -ones-who-brought this to you (plur.). This is your (plur.) punishment. How painful it is! As-if your (plur.) heart was-pierced/(stabbed).’” (Source: Hiligaynon Back Translation)
• English: “You will be punished very severely;
  it will be as though a sword has stabbed your inner beings.
  But you are causing those things to happen to you
  because of the evil things that you have done.’” (Source: Translation for Translators)