Here's an outstanding introduction to the richness of Christian spirituality, interior prayer, stillness, and inner transformation.  A handy little book by Martin Laird: Martin LairdInto the Silent Land: A Guide to the Christian Practice of Contemplation

"This book is different. There are plenty of books on contemplation that feel rather tired--either wordy and labored or unhelpfully smooth and idealistic. But this is sharp, deep, with no cliches, no psychobabble and no short cuts. Its honesty is bracing, its vision utterly clear; it is a rare treasure."

--Rowan Williams, The Archbishop of Canterbury

"Often they say 'you learn how to swim by swimming' but a good coach or swimming manual is essential. Equally, we could say 'you learn how to be contemplative by contemplating' and a good guide or mentor is necessary. Into the Silent Land is just that. I tried it and it works. Try it."

--Archbishop Desmond Tutu, winner of the Nobel Peace Prize