David R. Hawkins – Live your life like a prayer

The Wisdom of the Universe: Essential Truths from the Beloved Conversations with God Trilogy (Conversations with God Series)

Neale Donald Walsch

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Science of Being and Art of Living

Maharishi Mahesh Yogi

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LSD: Doorway to the Numinous: The Groundbreaking Psychedelic Research into Realms of the Human Unconscious

Stanislav Grof M.D.

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