Acharya Prashant emphasizes that for a seeker who is truly ready to learn, the entire existence acts as a Guru. He explains that spiritual growth requires a deep inner yearning and a realization of the futility of a superficial life. Many people live in a state of false satisfaction, which prevents the beginning of true spirituality. He clarifies that the 'Book of Life' can only be read by those who are willing to unlearn their existing knowledge and intellectual pride. To read this book, one must become 'unlettered' by erasing the hollow and incomplete information they have accumulated.