Can you explain the difference between 'Kamya' and 'Nishkam' motivations for studying a Guru's biography?

As detailed in Chapter 0, the study of a Guru's biography can be approached with two different mindsets. 'Kamya' is when the study is done with a desire for worldly outcomes, such as achieving prosperity or seeking relief from worries, diseases, or other calamities. In contrast, 'Nishkam' is when the study is performed with a selfless mind, with the sole purpose of attaining liberation from the cycle of birth and death. The preface clearly states that 'Nishkam' Guru service is always superior to 'Kamya' service.