I heard this story a few times, and it is one of my favourites:
Sōke Masaaki Hatsumi, head of the Bujinkan, had taught Steve Hayes (amongest others) from the USA in the 1970's. Mr Hayes, as well as his contemporaries from the US, had returned home in the late 70's/early 80's and begun to teach the Ninpo arts to people in the USA.
Ninjutsu became so popular that Soke Hatsumi was asked to go and teach for a while in the USA. Plans were made, but due to time constraints, Soke Hatsumi had only a small amount of time to learn English.
As Hatsumi would be teaching American students, the tutor & Hatsumi thought that learning commands to run a class were the most important thing to learn. So the tutor asked him what was the most important phrase in English that Hatsumi needed to know, the one thing that was imperative above all others, that he needed to tell people constantly so that they could learn the Ninpo arts.
Hatsumi replied "Keep going".
Not sure if this is what you were after, but I like the story.
"Let your food be your medicine, and your medicine be your food"