Worry Quotes - Page 33
Rhonda Byrne (2013). “The Secret Daily Teachings”, p.115, Simon and Schuster
Pema Chodron (2001). “Start Where You Are: A Guide to Compassionate Living”, p.18, Shambhala Publications
"The Brain That Changes Itself: Stories of Personal Triumph from the Frontiers of Brain Science". Book by Norman Doidge, 2007.