Tao Te Ching (Chapter 28)

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Know the strength of man,
But keep a woman's care!
Be the stream of the universe!
Being the stream of the universe,
Ever true and unswerving,
Become as a little child once more.
Know the white,
But keep the black!
Be an example to the world!
Being an example to the world,
Ever true and unwavering,
Return to the infinite.

Know honor,
Yet keep humility.
Be the valley of the universe!
Being the valley of the universe,
Ever true and resourceful,
Return to the state of the uncarved block.

When the block is carved, it becomes useful.
When the sage uses it, he becomes the ruler.
Thus, "A great tailor cuts little."

Tao Te Ching (Chapter 28), by Lao Tzu.