Any chapter seems to be the product of decades of contemplative thought. That I only rarely had trouble getting past the mysticism was due to the overwhelming compassion and humanity that exudes from this wonderful book. Ostensibly about the act of living, I'd argue that "The Art of Living" is as much or more about the very nature of life. It's only a tiny fraction of what I could have taken away, but meditative walking or practicing mindfulness on walks or runs has made me immediately aware of how un-present I am in life and how to be present for my family, others, and myself.
Thich Nhat Hanh's idea of 'interbeing' is almost immediately comprehensible, but almost impossible to retain and live by without intentional thought. If there's a more compelling path to seeing others through the lens of a shared humanity, I doubt I've come across it.