It's subjective to say which religious or spiritual books are the "most important" as it depends on the individual's beliefs and cultural background. However, some of the widely considered influential religious or spiritual books include:
- The Bible (Christianity)
- The Quran (Islam)
- The Bhagavad Gita (Hinduism)
- The Tao Te Ching (Taoism)
- The Book of Mormon (Mormonism)
- The Dhammapada (Buddhism)
- The Sutras (Buddhism)
- The Zohar (Judaism)
- The Guru Granth Sahib (Sikhism)
- The Yoga Sutras of Patanjali (Yoga)