Who said "Learn to perceive what the eye can't see."?

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

What is the original Japanese?

第七に目に見えぬ所をさとつて知る事. Translated from the original Japanese by Spartan Surfers.

Learn to perceive what the eye can't see.

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

The source

"Learn to perceive what the eye can't see." Miyamoto Musashi said it in The Book of Five Rings, Earth (The Nine Principles). Translated from the original Japanese by Spartan Surfers.

"第七に目に見えぬ所をさとつて知る事"

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 "Learn to perceive what the eye can't see."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Earth (The Nine Principles).
What is the original Japanese?: 第七に目に見えぬ所をさとつて知る事. Translated from the original Japanese by Spartan Surfers.