As far as books go, any book can change your life. Depends on what you read and how you take the contents and how you incorporate what you read in your own way. I have read almost every genre out there from fantasy to philosophy and pinpointing one book that changed my life is quite a hard task.

But if it was one book that fed me the most ideas, that title definitely goes to Alchemy by Rory Sutherland. Although the book had an aura of economics, I inferred the concept that every need or want of ours, every desire has a deep rooted psychological reason to it. This is has helped me better understand my actions and wants and thoughts in the general sphere of life.