Who said "To be useful, one must first be empty."?

This quote is attributed to Zhuangzi.

To be useful, one must first be empty. - Zhuangzi

"To be useful, one must first be empty."

Zhuangzi

Philosopher Chinese 369–286

"Do you have the patience to wait till the mud settles and the water is clear? Can you remain unmoving till the right action arises by itself?"

"When you realize there is nothing lacking, the whole world belongs to you."

"A man is born gentle and weak. At his death he is hard and insensitive."

"Perfect action leaves no trace."