BKS Iyengar on Yoga

what is yoga?

"The word yoga is related to the English word yoke. Yoga is the union of body, mind, and spirit—the union of your individuality with the divine intelligence that orchestrates the universe. Yoga is a state of being in which the elements and forces that comprise your biological organism are in harmonious interaction with the elements of the cosmos."
: Deepak Chopra and David Simon
The Seven Spiritual Laws of Yoga

what is 'dhyana'?

"As water takes the shape of its container, the mind when it contemplates
an object is transformed into the shape of that object. The mind which
thinks of the all-pervading divinity which it worships, is ultimately
through long-continued devotion transformed into the likeness of that
divinity."
BKS Iyengar
The Illustrated Light on Yoga