How does the author use the examples of Rama and Krishna to illustrate the necessity of a Guru?

The author uses the examples of Rama and Krishna to argue that if even divine incarnations require a Guru, then a mere mortal certainly does. As detailed in chapter 2, he points out that Rama, the son of Dasharatha and an incarnation of God, humbly 'held the feet of Vasistha.' Similarly, Krishna, described as the form of the Supreme Brahman, 'also had to take a Guru' and even 'bore the hardship of gathering wood at Sandipani’s house.' These examples serve to dismantle the author's own pride in debating, making him question, 'Then what of me? Why should I debate?' and reinforcing the scriptural truth that 'Without a Guru, there is no knowledge or spiritual goal.'