Who said "Tangled in the details? Suddenly think big."?

Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Fire (Rat's Head, Ox's Neck).

What is the original Japanese?

いかにもこまかなる內に、俄に大きなる心にして. Translated from the original Japanese by Spartan Surfers.

Tangled in the details? Suddenly think big.

Miyamoto Musashi, The Book of Five Rings, Fire (Rat's Head, Ox's Neck)

The source

"Tangled in the details? Suddenly think big." Miyamoto Musashi said it in The Book of Five Rings, Fire (Rat's Head, Ox's Neck). Translated from the original Japanese by Spartan Surfers.

"いかにもこまかなる內に、俄に大きなる心にして"

Original Japanese, The Book of Five Rings, Fire (Rat's Head, Ox's Neck). 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 "Tangled in the details? Suddenly think big."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Fire (Rat's Head, Ox's Neck).
What is the original Japanese?: いかにもこまかなる內に、俄に大きなる心にして. Translated from the original Japanese by Spartan Surfers.