This is the stuff that has influenced me more than anything else:
The Moral Equivalent of War- William James
Running&Being- Dr George Sheehan
Catcher in the Rye- Salinger
Chief Joseph of the Nez Perce- Robert Penn Warren
Comfort in Uncertainty- Pema Chodron
A River Runs Through It- Norman Maclean
Mountains beyond Mountains- Dr Paul Farmer
The River Why- David James Duncan
Wherever You Go, There You Are- Jon Kabat-Zinn
Letting Everything Become Your Teacher: 100 Lessons in Mindfulness- Jon Kabat-Zinn
In Defense of Food- Michael Pollan
All Our Relations- Winona LaDuke
Just about anything by Faulkner, Vonnegut, or Twain.
I read the bible a couple of years ago cover-to-cover. Definitely changed my views on things but I am not a christian.