In order to contract, It is necessary first to expand. In order to weaken, It is necessary first to strengthen. In order to destroy, It is first necessary to promote. In order to grasp, It is necessary first to give. This is called subtle light. The weak and the tender overcome the hard and the strong.
LaoziWater is fluid, soft, and yielding. But water will wear away rock, which is rigid and cannot yield. As a rule, whatever is fluid, soft, and yielding will overcome whatever is rigid and hard. This is another paradox: what is soft is strong.
Laozi