Based on the text, why is having a Guru considered absolutely necessary, and what prominent examples are provided to support this idea?

According to chapter 2, the author asserts that having a Guru is non-negotiable for spiritual progress, stating the firm scriptural truth: 'Without a Guru, there is no knowledge or spiritual goal.' To emphasize this point, he provides powerful examples of divine figures who still submitted to a Guru. He mentions that Rama, an incarnation of God, 'held the feet of Vasistha.' Similarly, Krishna, considered the 'form of the Supreme Brahman,' also took a Guru and performed humble tasks like gathering wood for his teacher, Sandipani. These examples serve to humble the author and illustrate the universal need for a spiritual guide.