According to Chapter 37, why is the pursuit of a conventional heaven through rituals considered insufficient, and what is the ultimate cause of suffering and rebirth?

Chapter 37 presents an advanced philosophical argument, questioning the desire for a heavenly abode attained through sacrifices and penance if it lacks the remembrance of Lord Narayana. The text dismisses this heaven as merely a place for sensual enjoyment, which it deems as having no use. The true cause of suffering and the eternal cycle of worldly existence (Samsara) is identified as the deluded knowledge of difference—the belief that 'Parabrahman is different from me.' As Chapter 37 explains, he who holds this belief of being separate from the ultimate reality is always subject to death and rebirth.