Lao Tzu 《Tao Te Ching》 28.Becoming

Using the male, being female,
Being the entrance of the world,
You embrace harmony
And become as a newborn.

Using strength, being weak,
Being the root of the world,
You complete harmony
And become as unshaped wood.

Using the light, being dark,
Being the world,
You perfect harmony
And return to the Way.