Reddit mentions of New Seeds of Contemplation

The Divine Conspiracy by Dallas Willard
Reading the Bible Again for the First Time by Marcus Borg
Mere Christianity by CS Lewis
The Meaning of Jesus by NT Wright and Marcus Borg
The Power of Now by Eckhart Tolle
New Seeds of Contemplation by Thomas Merton
A Lever and a Place to Stand by Richard Rohr

Check out the writings of the Trappist monk Thomas Merton if you haven't yet. Thich Nhat Hanh called him a living Buddha.

This is a very accessible introduction to Christian mysticism.

If you want to read more, I've heard good things about Christ the Eternal Tao written by an Eastern Orthodox priest-monk.

These are some of the books that I've enjoyed for spiritual reading (but it's hard to separate the books I've enjoyed as theology from spiritual readings some times!):

• Thomas Merton, New Seeds of Contemplation, and Bread in the Wilderness
  
• Christopher Jamison, Finding Sanctuary
  
• Pope Benedict XVI, The Infancy Narratives, In the Beginning, and Church Fathers
  
• Augustine, Confessions

The best example of contemplation that I've seen is Thomas Merton

Henri Nouwen ([Life of the Beloved](http://www.amazon.com/Life-Beloved-Spiritual-Living-Secular/dp/0824519868), [Return of the Prodigal Son](http://www.amazon.com/Return-Prodigal-Son-Story-Homecoming/dp/0385473079), [Seeds of Hope](http://www.amazon.com/books/dp/0385490496))
Karl Rahner (The Great Church Year, Love of Jesus and the Love of Neighbor)
Thomas Merton ([New Seeds of Contemplation*](http://www.amazon.com/New-Seeds-Contemplation-Thomas-Merton/dp/0811217248))

Anything by Thomas Merton is excellent. Contemplative Prayer and New Seeds of Contemplation can be good starts.

Richard Rohr, Henri Nouwen and Thomas Keating will also be good readings.

Buy and read this book: http://www.amazon.com/New-Seeds-Contemplation-Thomas-Merton/dp/0811217248/ref=sr_1_1?s=books&ie=UTF8&qid=1418926593&sr=1-1&keywords=new+seeds+of+contemplation

It's very lovely.