Though I have never met either man, Dallas Willard and AW Tozer are my spiritual role models. Both men have an acute grasp of the philosphical and practical implications of true heart beliefs for walking with Jesus Christ. Whereas Tozer models classic prophet gifting through a blunt, sometimes abrasive, proclamation of truth, Willard tempers his gift with an unusual balance.
Many academic writers of spiritual material tend to be much too erudite. They seem to be more interested in categorizing God than in knowing him. They also seem to be more interested in identifying and pigeon-holing people than in loving them. Willard cuts against the grain of professiorial arrogance and demonstrates instead an excellent balance of love of God, love for people in community and well-thought out philosophy of Christian faith.
Spirit of the Disciplines discusses the role of the body in the development of spiritual maturity. Willard addresses Christianity's fear of the flesh by walking the user through an intellectually challenging discussion on his perception of the importance of bringing the body into relationship with Christ.
If I could reduce Willard's argument to a single concept (at the risk of too much reduction that might offend brother Willard), I would say this: 'No matter where you are, there your body is. For this reason, your body is key to all that you do as a disciple of Jesus.'
Think about it: the essence of faith is love and love is not expressed through abstract ideas or expressions. Love is done in action for someone else. Love can be spoken or it can be acted out but the body is the source of all expressions of love. Love is not merely thinking how nice it would be if I raked my neighbor's yard. Instead, love is expressed when I move my body to grab a rake and step into my neighbor's yard to complete the job.
Likewise, the body is the source of all expressions of sin. It is for this reason that disciplines are required to bring the body into progressive submission to obedience to Christ. I believe Willard to be saying that the degree to which we express love and sin through our bodies is a measure of our maturity in the faith and the depth of our vital love for God and others.
This book, along with Willard's, "In Search of Guidance," has been one of the most formative books for my walk with Christ. I strongly recommend this rigorous book for excellent brain and heart food.