“Qi is the animating force that gives us our capacity to move, think, feel, and work.” Harriet Beinfield & Efrem Korngold, authors Between Heaven and Earth.
“Qi is matter on the verge of becoming energy, or energy at the point of materializing.” Ted Kaptchuk, author The Web That Has No Weaver.
“The character for Qi indicates that it is something which is, at the same time, material and immaterial." Giovanni Maciocia, author The Foundations of Chinese Medicine.
“Qi is the basic substance by which all movements and mutations of all phenomena in the universe arise.” Nigel Wiseman & Andrew Ellis, authors Fundamentals of Chinese Medicine.