How does the text link the practice of 'Parayan' to the ultimate goal of liberation, particularly distinguishing between 'Kamya' and 'Nishkam' service?

The preface in Chapter 0 connects the ancient practice of Parayans (readings) and Saptahs (weekly recitations) directly to one's spiritual aspirations. It explains that these devotional readings of sacred texts or a Guru's biography can be performed in two ways. They can be done with desire (Kamya), to seek worldly prosperity or relief from calamities and disease. However, the text emphasizes that the superior method is to perform them with a selfless mind (Nishkam), with the sole purpose of attaining liberation from the cycle of birth and death. As Chapter 0 concludes, this Nishkam Guru service is always considered superior and is the recommended path for achieving the ultimate spiritual goal.