Who said "Pay attention even to small things."?

Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Earth (The Nine Principles).

What is the original Japanese?

第八にわづかなる事にも氣を付る事. Translated from the original Japanese by Spartan Surfers.

Pay attention even to small things.

Miyamoto Musashi, The Book of Five Rings, Earth (The Nine Principles)

The source

"Pay attention even to small things." Miyamoto Musashi said it in The Book of Five Rings, Earth (The Nine Principles). Translated from the original Japanese by Spartan Surfers.

"第八にわづかなる事にも氣を付る事"

Original Japanese, The Book of Five Rings, Earth (The Nine Principles). 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 "Pay attention even to small things."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Earth (The Nine Principles).
What is the original Japanese?: 第八にわづかなる事にも氣を付る事. Translated from the original Japanese by Spartan Surfers.