İ think the translation is
السعادة ليست بالخارج لنا لنجدها ، السبب أنها ليست بالخارج هي أنها موجودة بداخلنا
İ think it means that the happiness can come from ourselves like doing what we love and loving what we do , also make things that feel ourselves this feeling (happiness ... Etc
Also, I think it means that happiness is not limited on specific things
Have a bueatiful day❤