Who said "In the fight, keep your everyday mind."?

Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Water (The Mind in Strategy).

What is the original Japanese?

兵法の道に於て、心の持樣は常の心に替る事なかれ. Translated from the original Japanese by Spartan Surfers.

In the fight, keep your everyday mind.

Miyamoto Musashi, The Book of Five Rings, Water (The Mind in Strategy)

The source

"In the fight, keep your everyday mind." Miyamoto Musashi said it in The Book of Five Rings, Water (The Mind in Strategy). Translated from the original Japanese by Spartan Surfers.

"兵法の道に於て、心の持樣は常の心に替る事なかれ"

Original Japanese, The Book of Five Rings, Water (The Mind in Strategy). 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 "In the fight, keep your everyday mind."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Water (The Mind in Strategy).
What is the original Japanese?: 兵法の道に於て、心の持樣は常の心に替る事なかれ. Translated from the original Japanese by Spartan Surfers.