Brihat Parashara Hora Shastra
यद्रवेरायनं वीर्यं चेष्टाख्यं तावदेव हि । विधोः पक्षबलं यावत् तावच्चेष्टाबलं स्मृतम् ॥ १८॥
Motional Strength for Sūrya and Candr. Sūrya‟s Chesht Bal will correspond to his Ayan Bal. Candr‟s Paksh Bal will itself be her Chesht Bal.
english translation
yadraverAyanaM vIryaM ceSTAkhyaM tAvadeva hi । vidhoH pakSabalaM yAvat tAvacceSTAbalaM smRtam ॥ 18॥
hk transliteration by Sanscript