Following are a number of back-translations as well as a sample translation for translators of Ecclesiastes 7:23:

• Kupsabiny: “I used wisdom to test all these things and I said to myself, ‘I want to become wise’ but wisdom was far from me.” (Source: Kupsabiny Back Translation)
• Newari: “All this I have tested with my wisdom, and I said,
  "I have determined to be wise."
  but even this is beyond me.” (Source: Newari Back Translation)
• Hiligaynon: “I tested to understand all that happens here on earth by my wisdom. I thought that I can-understand, but in-fact/(surprise particle) I could not.” (Source: Hiligaynon Back Translation)
• English: “I said to myself that I would use my wisdom to study all the things that I have written about,
  but I was not able to do it successfully.” (Source: Translation for Translators)