风筝线

风筝线要松要紧！

放风筝时死拽着线，风筝反而打旋儿掉下来。老聃骑青牛过函谷关时就懂：线拉得太绷是跟风较劲，松三分反而飞得比云彩高。Loosen the kite string—stiff control crashes flights. The Dao is like wind