Following are a number of back-translations as well as a sample translation for translators of Proverbs 14:10:

• Kupsabiny: “A person knows in his stomach/heart what pains (him),
  but/and if it is joy, he himself is the one rejoicing.” (Source: Kupsabiny Back Translation)
• Newari: “One can experience only
  his own sorrows and delights,
  It is not possible
  to share them with others.” (Source: Newari Back Translation)
• Hiligaynon: “You (sing.) alone know how very happy or sad you (sing.) are.” (Source: Hiligaynon Back Translation)
• Kankanaey: “It is only you (sing.) who knows the likeness of your (sing.) sorrow or happiness. Another person does not properly empathize (lit. feel-with).” (Source: Kankanaey Back Translation)
• English: “If you are very sad or if you are joyful, only you know what you are experiencing;
  no one else can know what you are feeling.” (Source: Translation for Translators)