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People who meditate are working to strengthen their conscious connection with the Authentic Self. This part of consciousness is the gateway to the spiritual dimensions that have been written about and described since ancient times.
H. Ronald Hulnick Ph.D. • Loyalty to Your Soul: The Heart of Spiritual Psychology
The Wayward Mind by Guy Claxton.
Joe Vitale • Zero Limits: The Secret Hawaiian System for Wealth, Health, Peace, and More
explaining how the Divine is our zero state—
Joe Vitale • Zero Limits: The Secret Hawaiian System for Wealth, Health, Peace, and More

Marianne Williamson
open.spotify.com
In addition to our own two books based on Psychology of Mind, The Serenity Principle (Joseph Bailey) and You Can Feel Good Again (Richard Carlson), there are several other excellent books available, including the primary resource book on POM, The Renaissance of Psychology, by Dr. George Pransky.
Richard Carlson • Slowing Down to the Speed of Life: How to Create a more Peaceful, Simpler Life from the Inside Out
Spiritual practice supports the development of personal power.
Marianne Williamson • A Return to Love: Reflections on the Principles of A Course in Miracles (The Marianne Williamson Series)
The experience may be slightly different from practice to practice (and lesson to lesson), but the essence revolves around discovering (or rediscovering) the wisdom of the self.