Brihat Parashara Hora Shastra
पादार्धं समभे प्रोक्तं शून्यं नीचास्तशत्रुभे। तद्वद्दुष्टफलं ब्रूयाद् व्यत्ययेन विचक्षणः॥ ६०॥
The good effects are nil in debilitation, or enemy‟s camp. Inauspicious effects are quite reverse with reference to what is stated.
english translation
pAdArdhaM samabhe proktaM zUnyaM nIcAstazatrubhe। tadvadduSTaphalaM brUyAd vyatyayena vicakSaNaH॥ 60॥
hk transliteration by Sanscript