Who said "Perceive strongly. Look lightly."?

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

What is the original Japanese?

觀の目つよく見の目よはく. Translated from the original Japanese by Spartan Surfers.

Perceive strongly. Look lightly.

Miyamoto Musashi, The Book of Five Rings, Water (The Gaze)

The source

"Perceive strongly. Look lightly." Miyamoto Musashi said it in The Book of Five Rings, Water (The Gaze). Translated from the original Japanese by Spartan Surfers.

"觀の目つよく見の目よはく"

Original Japanese, The Book of Five Rings, Water (The Gaze). 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 "Perceive strongly. Look lightly."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Water (The Gaze).
What is the original Japanese?: 觀の目つよく見の目よはく. Translated from the original Japanese by Spartan Surfers.