『万里一空』

"Banri-ikkuu"

<tn>TN: A philosophy from Miyamoto Musashi's Book of Five Rings.
The literal meaning is "A Thousand Principles and Emptiness".
Originally it meant "the world is under one sky no matter how far you go" (一空 means "one sky" and 万里 means "thousands of miles"), but it's more popular to be interpreted as "keep striving towards one goal no matter the hardships".</tn>