Who said "Morning after morning, hour after hour, polish your mind."?

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

What is the original Japanese?

朝々時々におこたらず、心意二ッの心をみがき. Translated from the original Japanese by Spartan Surfers.

Morning after morning, hour after hour, polish your mind.

Miyamoto Musashi, The Book of Five Rings, Void

The source

"Morning after morning, hour after hour, polish your mind." Miyamoto Musashi said it in The Book of Five Rings, Void. Translated from the original Japanese by Spartan Surfers.

"朝々時々におこたらず、心意二ッの心をみがき"

Original Japanese, The Book of Five Rings, Void. 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 "Morning after morning, hour after hour, polish your mind."?: Miyamoto Musashi (c. 1584–1645). Source: The Book of Five Rings, Void.
What is the original Japanese?: 朝々時々におこたらず、心意二ッの心をみがき. Translated from the original Japanese by Spartan Surfers.