Humanism is one way of thought. We do not need the supernatural realm to be ethical and reach our potential.
I shed the word "spiritual" as a personal adjective. New age philosophies have attempted to redefine the word as its antonym, but it just strikes me as another way to make atheism more palatable to non-atheists. IMHO
spir·it·u·al ˈspiriCHo͞oəl adjective adjective: spiritual
- 1.
of, relating to, or affecting the human spirit or soul as opposed to material or physical things.
"I'm responsible for his spiritual welfare"
- (of a person) not concerned with material values or pursuits.
- 2. of or relating to religion or religious belief. "the tribe's spiritual leader" noun