ðɪ aɪdˈiə ɪz ðˈætwˌʌn mˈʌst biː ɡˈʊd ænd mˈɔːɹəl bɪkˈʌz fˈɔːlɪŋ bᵻlˌoʊ ðə hjˈuːmən ɹˈɛlm ɪz dˈeɪndʒɚɹəs æz ðɪ ˈɑːdz ʌv wˈʌn bᵻkˈʌmɪŋ ɐ hjˈuːmən ɐɡˈɛn wɪð ˌɛni ɡɹˈeɪt fɹˈiːkwənsi ɪz slˈɪm.
The idea is that one must be good and moral because falling below the human realm is dangerous as the odds of one becoming a human again with any great frequency is slim.