The same attitude of relaxed gentleness [practiced in judo] is most beautifully seen when you watch cats climbing trees. When a cat falls out of a tree, it lets go of itself. The cat becomes completely relaxed, and lands lightly on the ground. But if a cat were about to fall out of a tree and suddenly made up its mind that it didn't want to fall, it would become tense and rigid, and would be just a bag of broken bones upon landing.
In the same way, it is the philosophy of the Tao that we are all falling off a tree, at every moment of our lives. As a matter of fact, the moment we were born we were kicked off a precipice and we are falling, and there is nothing that can stop it. So instead of living in a state of chronic tension, and clinging to all sorts of things that are actually falling with us because the whole world is impermanent, be like a cat. Don't resist it.