Following are a number of back-translations as well as a sample translation for translators of Proverbs 15:7:

• Kupsabiny: “A person of understanding goes around speaking words of wisdom,
  but the one with a foolish head/mind, has nothing to teach people.” (Source: Kupsabiny Back Translation)
• Newari: “From the mouths of the wise
  come words of knowledge,
  but the hearts of fools are not like that.” (Source: Newari Back Translation)
• Hiligaynon: “The wise spread-out wisdom; the fools can- not -do this.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The words of the wise give wisdom/intelligence, but the thoughts of a fool, they (lit. it) have no use/purpose.” (Source: Kankanaey Back Translation)
• English: “What wise people teach causes others to know much more,
  but foolish people cannot teach others what is useful.” (Source: Translation for Translators)