At the end of my WIP, a utopian society is founded, and all their laws are based on the phrase, “Do no harm.” Yes, I know this is lifted from the Hippocratic Oath (primum non nocere), what I wonder is if I need to add a citation?
Who do you think would challenge its use? I wouldn't give it a second thought.
But what if Hippocrates' (a Bill & Ted voiceover insists on calling him Hippo Crates) offspring, and theirs, and theirs, renewed copyright for thousands of years?
Nah, still not long enough. You're golden.