"What is the book that changed your life? (not novels or religious texts)"
I think it's a wonderful way to connect in a less superficial way and learn a little more about each other. It's also a wonderful way to discover new books worth reading.
This is one of them (the full list is here):
With his bestselling spiritual guide The Power of Now, Eckhart Tolle inspired millions of readers to discover the freedom and joy of a life lived "in the now." In A New Earth, Tolle expands on these powerful ideas to show how transcending our ego-based state of consciousness is not only essential to personal happiness, but also the key to ending conflict and suffering throughout the world. Tolle describes how our attachment to the ego creates the dysfunction that leads to anger, jealousy, and unhappiness, and shows readers how to awaken to a new state of consciousness and follow the path to a truly fulfilling existence.
The Power of Now was a question-and-answer handbook. A New Earth has been written as a traditional narrative, offering anecdotes and philosophies in a way that is accessible to all. Illuminating, enlightening, and uplifting, A New Earth is a profoundly spiritual manifesto for a better way of lifeand for building a better world.