Who said "Become a rock. Nothing hits you. Nothing moves you."?

Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Fire (The Body of a Rock).

What is the original Japanese?

忽ち岩尾の如くに成て、萬事あたらざる所、うごかざる所. Translated from the original Japanese by Spartan Surfers.

Become a rock. Nothing hits you. Nothing moves you.

Miyamoto Musashi, The Book of Five Rings, Fire (The Body of a Rock)

The source

"Become a rock. Nothing hits you. Nothing moves you." Miyamoto Musashi said it in The Book of Five Rings, Fire (The Body of a Rock). Translated from the original Japanese by Spartan Surfers.

"忽ち岩尾の如くに成て、萬事あたらざる所、うごかざる所"

Original Japanese, The Book of Five Rings, Fire (The Body of a Rock). Japanese: Miyamoto Musashi (Kinkodo, 1909), NDL digital text.

Who said it

Miyamoto Musashi (c. 1584–1645). Undefeated swordsman who wrote The Book of Five Rings in a cave a few weeks before he died.

Questions

Who said "Become a rock. Nothing hits you. Nothing moves you."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Fire (The Body of a Rock).
What is the original Japanese?: 忽ち岩尾の如くに成て、萬事あたらざる所、うごかざる所. Translated from the original Japanese by Spartan Surfers.