Some of the books have a link to quotes so that you can already get started.
More books are being added regularly.  Suggestions are always welcome.

---

A Brief History of Everything Ken Wilber

A Course in Miracles Foundation for Inner Peace

As a Man Thinketh James Allen

Be As You Are Sri Ramana Maharshi

Comfortable with Uncertainty: 108 Teachings on Cultivating Fearlessness and Compassion Pema Chodron

Conversations With God: An Uncommon Dialogue (book 1) Neale D. Walsh

Do What You Love, the Money Will Follow: Discovering Your Right Livelihood Marsha Sinetar

Eat, Pray, Love: One Woman's Search for Everything Across Italy, India and Indonesia Elizabeth Gilbert

Shambhala: The Sacred Path of the Warrior Chogyam Trungpa

Tao Te Ching Lau Tsu

The Alchemist Paulo Coelho (approx. 150 quotes)

The Artist's Way Julia Cameron

The Bhagavad Gita

The Celestine Prophecy: An Adventure James Redfield (approx. 310 quotes)

The Dhammapada

The Four Agreements Don Miguel Ruiz (approx. 200 quotes)

The Gift Hafiz and Daniel Ladinsky

The Love Poems of Rumi Deepak Chopra

The Mastery of Love: A Practical Guide to the Art of Relationship: A Toltec Wisdom Book Don Miguel Ruiz

The Monk Who Sold His Ferrari: A Fable About Fulfilling Your Dreams & Reaching Your Destiny Robin Sharma

The Prophet Kahlil Gibran

The Tibetan Book of Living and Dying Sogyal Rinpoche

The Tipping Point: How Little Things Can Make A Big Difference Malcolm Gladwell

The Upanishads

The Yoga Sutras of Petanjali Petanjali

Siddhartha Hermann Hesse

Synchronicity: Through the Eyes of Science, Myth, and Trickster Alan Combs, Mark Holland, Robin Robertson

Way of the Peaceful Warrior: A Book That Changes Lives Dan Millman

Zen Mind, Beginner's Mind Shunryu Suzuki