Who said "A life is a white horse flashing past a crack in the wall."?

Zhuangzi (c. 369–286 BC). Source: Zhuangzi 22 (Knowledge Rambling in the North).

What is the original Chinese?

人生天地之間，若白駒之過郤，忽然而已。. Translated from the original Chinese by Spartan Surfers.

A life is a white horse flashing past a crack in the wall.

Zhuangzi, Zhuangzi 22 (Knowledge Rambling in the North)

The source

"A life is a white horse flashing past a crack in the wall." Zhuangzi said it in Zhuangzi 22 (Knowledge Rambling in the North). Translated from the original Chinese by Spartan Surfers.

"人生天地之間，若白駒之過郤，忽然而已。"

Original Chinese, Zhuangzi 22 (Knowledge Rambling in the North). Chinese: Zhuangzi text via zh.wikisource; chapter title after Legge 1891.

Who said it

Zhuangzi (c. 369–286 BC). Taoist storyteller of the butterfly dream, the useless tree and the cook who never dulled his knife.

Questions

Who said "A life is a white horse flashing past a crack in the wall."?: Zhuangzi (c. 369–286 BC). Source: Zhuangzi 22 (Knowledge Rambling in the North).
What is the original Chinese?: 人生天地之間，若白駒之過郤，忽然而已。. Translated from the original Chinese by Spartan Surfers.