The main thesis of the book is that the practice of silence and meditation can help individuals to connect with their inner selves and with the divine, and to tap into a higher level of consciousness. Bush argues that in order to experience the benefits of silence, it is necessary to let go of our thoughts and to enter into a state of deep relaxation and receptivity.

The book provides practical guidance on how to cultivate the practice of silence and meditation, including techniques for relaxation, breathing, visualization, and affirmation. Bush also discusses the role of faith and intention in the practice of silence, and emphasizes the importance of cultivating a positive mental attitude.

One of the key themes of the book is the importance of self-awareness and self-discovery. Bush encourages readers to take the time to reflect on their own thoughts, feelings, and desires, and to develop a deeper understanding of themselves and their connection to the universe.

Overall, "The Silence: What It Is and How to Use It" is a spiritual and philosophical work that offers practical guidance on the practice of silence and meditation as a means of achieving inner peace and spiritual growth.

The book provides a unique perspective on the power of silence and encourages readers to cultivate a deeper connection with themselves and with the divine. While some of the language and ideas in the book may seem outdated to modern readers, the principles outlined in the book are still relevant today and can be applied to anyone's life, regardless of their religious or philosophical beliefs.