Could you elaborate on the concepts of 'Kamya' and 'Nishkam' as they apply to the study of Guru biographies and other sacred texts?

Chapter 0 explains that spiritual texts, including Guru biographies, can be used in two distinct ways: with desire (Kamya) and with a selfless mind (Nishkam). 'Kamya' use is when one studies or recites these texts for worldly purposes, such as achieving prosperity or seeking relief from worries, diseases, or other calamities. 'Nishkam' use, on the other hand, is when the study is performed with a selfless mind, purely for the purpose of spiritual liberation from the cycle of birth and death. The text in Chapter 0 is unequivocal in stating that Nishkam Guru service, whether through writing a biography or any other means, will always be superior.