This should be a surprise to you being a less known book. I found this book cross-referenced in Cal Newport’s book, Deep Work, which is also a great book in itself. I thanked Cal specifically to lead me to this book. We, the knowledge workers, lead an intellectual life and this book makes us realize our duty to the mankind. It’s very practical book and more than anything, is proven to be timeless. Two advices: Do not get perturbed by the English that would sound anachronous. Substitute the “faith” references to whatever “superpower” that you believe in.