Can you explain the two different motivations for studying sacred texts like Guru biographies, and which one is deemed superior?

Chapter 0 describes two distinct ways to engage with sacred texts, including Guru biographies and knowledge texts. The first method is 'Kamya,' which involves studying with a specific desire or goal in mind. This could be for achieving worldly prosperity or seeking relief from worries, calamities, and diseases. The second method is 'Nishkam,' which is a selfless approach to study, undertaken purely for the sake of liberation from the world and the cycle of birth and death. The text makes it very clear that Nishkam Guru service is always considered superior, whether it involves writing a biography or any other form of service.