Following are a number of back-translations as well as a sample translation for translators of Proverbs 18:1:

• Kupsabiny: “A person who isolates himself is selfish,
  and he sneers at every good decision.” (Source: Kupsabiny Back Translation)
• Newari: “A loner cares only about himself.
  He does not even heed the true words of others.” (Source: Newari Back Translation)
• Hiligaynon: “A man who just always want to be alone only thinks of himself, and he is against the right/positive thinking of others.” (Source: Hiligaynon Back Translation)
• Kankanaey: “The person who does not know how to companion-with his fellow people, it is only himself (lit. his body) that he thinks-about. He opposes everything that is right in the viewpoint of others.” (Source: Kankanaey Back Translation)
• English: “Those who separate themselves from other people think only about those things that they are interested in;
  if they would continually associate with those who have good judgment/sense, they would constantly disagree/quarrel with them.” (Source: Translation for Translators)