unremittingly

やっと五輪書 "The Book of Five Rings and Other Works" の本文に入りました。The Earth Scroll(地の巻)から引用します。

For those who care to learn my principles of combat strategy, follow these rules in observing the Way:
1. Think never to veer from the Way
2. Train unremittingly in the Way
3. Acquaint yourself with all arts
4. Know the Ways of all vocations
5. Discern the truth in all things
6. See the intrinsic worth in all things
7. Perceive and know what cannot be seen with the eyes
8. Pay attention even to trifles
9. Do not engage in superfluous activities

"unremittingly" を辞書で調べます。

・Oxford English Dictionary: never stopping: unremitting hostility
・Collins Dictionary: Something that is unremitting continues without stopping or becoming less intense.: He watched her with unremitting attention.
・Cambridge English Dictionary: never stopping, becoming weaker, or failing: Our thanks are due to Bob Lawrence whose unremitting labours have ensured the success of the whole project.
・Vocabulary.com: During a heat wave, it's not always the temperature itself that's a problem. It's that the heat is unremitting––you don't get a break from it. It's sweltering hot day after day after day.
You'd think the word unremitting would be connected to the word remit, but that's true in only a loose way. Remit means to send back––but if you remit a debt, you forgive it, or lift it. Unremitting describes something that is never lifted or sent back. Like the Energizer Bunny, it keeps coming and coming and coming.

さすが宮本武蔵です。武芸以外にも通じる原則ですね。