Start with high-confidence spiritual healing books, then narrow by subgenre or adjacent topics.
The Perennial Philosophy
Aldous Huxley
Conscious
Annaka Harris
Radical Compassion
Tara Brach
Sacred Contracts
Caroline Myss
How to Starve Cancer
Jane McLelland
Dying to Be Me
Anita Moorjani
The Wild Edge of Sorrow
Francis Weller, Thomas Hübl
The Pain Solution
MD LAc Saloni Sharma, MD Andrew Weil