In the springtime, together the heaven and earth bring forth life and the 10,000 things are enlivened. Go to sleep at night fall, and wake up at dawn. After waking up, walk around the courtyard with broad strides. Let down the hair and relax the body. Allow the will to be productive. Live and do not kill. Give and do not take away. Reward and do not punish. This resonates with the energy of spring. It is the way of nourishing life. To act in opposition to this injures the liver....."From the Huang di Neijing