Hayanaratna · by Balabhadra
Chapter 1 · Planets, Signs, Year Entry
ग्रहराशिस्वरूपवर्षप्रवेशाद्यानयनाधिकारः
उक्तं च स्मृतौ ॥"न वदेद्यावनीं भाषां प्राणैः कंठगतैरपी"ति ।
And it is said in the Smriti (law books): 'One should not speak the Yavana tongue. Not even with one's life in one's throat.'
Simple meaning: The Smriti rule: never speak the foreign tongue, even when close to the end.
तन्मूलभूतत्वात्सदमरसिंहादिशास्त्रस्याप्यध्ययनमनुचितं मूलाशुद्ध्या सर्वमशुद्धमितिन्यायात् ॥
The objection goes on: Samarasimha's work grows from the Yavana work, so it too seems unfit.
अत्रोच्यते । यवनाचार्यस्याष्टादशसंहिताकर्तृषु परिगणितत्वात्तद्वचः प्रमाणमेव ॥
Answer: Yavanacharya is one of the eighteen founders, so his words count.
उक्तं च कश्यपेन ॥
The eighteen founders of astrology, part 1: Surya, Pitamaha, Vyasa, Vasishtha, Atri, Parashara, Kashyapa, Narada, Garga, Marichi, Manu, Angiras.