Following are a number of back-translations as well as a sample translation for translators of Proverbs 12:15:

• Kupsabiny: “A foolish person thinks that what (he) is doing is right/good,
  but a wise person loves to be advised/corrected.” (Source: Kupsabiny Back Translation)
• Newari: “The fool thinks his own ideas are right,
  but one who has wisdom
  will listen to the advice of others.” (Source: Newari Back Translation)
• Hiligaynon: “A fool man thinks that he is always right, but a wise man listens to advice.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The foolish, they say/think that entirely right/correct is what they are-doing, but the wise, they listen to advice.” (Source: Kankanaey Back Translation)
• English: “Foolish people always think that what they are doing is right;
  wise people heed other people when they give them good advice.” (Source: Translation for Translators)