Ramayana
रूपयौवनसम्पन्ना यस्मात्त्वमनवस्थिता । तस्माद्रूपवती लोके न त्वमेका भविष्यति ॥ 7-30-38 ॥
'Because you, endowed with beauty and youth, have not remained steadfast, for that reason you shall not be the only beautiful woman in the world.'
english translation