This is a fantastic introduction to practicing contemplative prayer and Christian mysticism. I must say that some of those old Christian mystics are hard to understand, but as this is a contemporary book, it is quite easy and practical.

I think as meditation is growing more popular in western circles (search for "meditation" in the app store to get an idea) because of all of its significant impacts on health and creativity, Christians might also be interested in practicing meditation. But we should be aware that Christianity has a long and well-documented history of practicing meditation that is based on entering in communion with God's Spirit and resting in God's Presence. So if you are curious about that, this book is a great place to start.

This book can be found online with a quick search, and I have listed the chapter order below because it is not quite clear on the website.

Prayer to the Holy Spirit
Introduction
What Contemplation Is Not
Dimensions of Contemplative Prayer
The History of Contemplative Prayer in the Christian Tradition
First steps in Centering Prayer
The Sacred Word as Symbol
The Ordinary Kinds of Thoughts
Birth of Spiritual Attentiveness
The More Subtle Kinds of Thoughts
The Unloading of the Unconscious
Summary of the Centering Prayer Method
The Intensive Centering Prayer Experience
Methods of Extending the Effects of Contemplative Prayer into Daily Life