Based on Chapter 17, what is the role of a Guru, and what distinguishes a person who is truly 'learned'?

Chapter 17 highlights the indispensable role of the Guru in guiding a spiritual seeker. It states that the Guru shows the path to a place so profound that even the sun's rays cannot see it and where the steps of the Vedas cannot enter, illustrating the Guru's ability to reveal ultimate truth beyond conventional knowledge. The chapter also critiques superficial learning, questioning the benefit of being 'learned' if one does not know right from wrong or is constantly wallowing in sinful deeds. It posits that a person who is always restless, whose heart is unsatisfied, and whose mind is distracted by greed will not find peace even with knowledge. This implies that being truly learned involves both wisdom and righteous conduct, not just intellectual accumulation.