There are so many known and forgotten books, literature, and writings that have shown light, 

reflected, refracted, helped, hurt, illumined, bent, built and broken confines of thought processes time and time again through my life.    Most books listed that include commentary have first been read and digested to my ability of comprehension, and then re-read with the commentary.    

As with the consumption of food,   without giving time for digestion and the benefit of the food to disperse throughout the body,   continual consumption of that which was perceived as good and beneficial becomes harmful.  .  If words, ideas, perceptions and conceptions aren't digested like the intake of food, too much consumption at one time will make one sick! 

Toltec way by Dr Susan Gregg

The heart of Yoga by T. K. V. Desikachar

The Holy Bible 

King James KJV Oxford Minion 16 mo Holy Bible Old & New Testaments

Be here Be now by Ram Das

Autobiography of a Yogi by Paramahansa Yogananda

Guru for the Aquarian Age: The Life and Teachings of Guru Nanak

by Parmatma Singh Khalsa

The upanishads various translations

Bhagavad Gita various translations

Ramayana by Ramesh Menon

The Yoga Sutras of Patanjali various translations, versions and authors

Buddhist sutras, thousands everywhere! 

The Mystic Self, Uncommon sense Vs. Common senseon 

by Rayon

The Prophet by Kahlil Gibran

The Second Coming of Christ by Paramahansa Yogananda

Anastasia, The ringing cedars of Russia by Vladmere Verge

Holy Science by Swami Sri Yukteswar

Purana Purusha  by Ashoke Kumar Chatterjee
 

Journey of Souls by Michael Newton

Lost Gospels of Jesus by Anonymous

Babaji’s Master key to all ills by VT Neelakantan and SAA Ramaian

And on and on and on!