“The coming and the going of heat and cold is the contraction and expansion of a year. The coming and the going of the sun and the moon is the contraction and expansion of energy. The coming and the going of the past and present is the contraction and expansion of time.
The interdependence of being and non being, difficulty and ease, long and short, high and low – all are principles of contraction and expansion. If one knows the way of mutual influence of contraction and expansion, then one can comprehend endless benefits in the world”
from the The Book of Balance and Harmony