Brihat Parashara Hora Shastra
शुभपापफलाभ्यां च हन्याद् दृष्टिं बलं तथा । दृष्टी ते शुभपापाख्ये बले स्यातां तदाह्वये ॥ १४॥
Auspicious, or inauspicious aspect will be by multiplying the Subh, or Asubh Pankthi. Similarly auspicious, or inauspicious effects will be known by multiplying the auspicious, or inauspicious strength by the respective Pankthi.
english translation
zubhapApaphalAbhyAM ca hanyAd dRSTiM balaM tathA । dRSTI te zubhapApAkhye bale syAtAM tadAhvaye ॥ 14॥
hk transliteration by Sanscript