The Crest-Jewel of Siddhantas

...due to the arising of criticism, their pleasure is inferred from observing their commentary, thinking 'how is it that he said this incorrectly?', with their minds given to mockery. Because laughter is generated by pleasure. Thus, whoever has a correct understanding of the meanings, for him there is no flashing of criticism. Whoever has no flashing of criticism, for him there is no lack of understanding of the meanings; thus, no one will criticize my statement. Therefore, it was said before that it is "pure"; this is the meaning. This is the Anushtup meter called Vitana. The meaning of this is: here in the Anushtup class of meters, the meter other than Samanika and Pramanika is called Vitana. "By these" refers to what was mentioned before. Therefore, there is no over-application to Chitrapada, Vidyunmala, Manavaka, and Hamsaruta meters; enough of this. 5.

Now, with the next verse, he states the definition of a Siddhanta text, and with the following two verses, he states the praise of the Siddhanta original: "अथैतश्लोकेन सिद्धान्तग्रन्थलक्षण-मनन्तरश्लोकद्वयेन सिद्धान्तप्रशंसां चाह".

"The calculation of time from the dhruva epoch to the pralaya dissolution, the various types of measures, the motion of the celestial bodies in order, the two-fold mathematics, questions along with their answers,
and the statement of the position of the earth, constellations, and planets—that which is taught here is called a Siddhanta by the wise in the collection of mathematical books." 6.

"He who knows the Jataka horoscopy and Samhita collection, even if he knows a part of the mathematical texts, is useless to those whose intelligence is clever in the essence of the study of Jyotisha astronomy/astrology.
He who does not know the Siddhanta, which is spread out with infinite logical arguments, is like a king in a painting on a wall, or a lion made of wood that is well-carved." 7.

"Just as a royal army without roaring elephants, even if it has strong horses, does not shine;
or a garden without the mango tree, or a lake without water;
or a woman without her new, beloved husband—in the same way, O wise ones, they say the science of Jyotisha astronomy is without the Siddhanta." 8.

Vasana Bhashya Commentary on the underlying rationale — It is clear. 6-8.

Vasana Varttika Explanatory notes on the rationale — Whatever inquiry is started for a purpose, at its conclusion, that same thing should be in the mind...