You're not fronting having read all Hemingway, you're sharing a quote with everyone. It's fine if you heard it in Kingsman, just as it would have been fine if you had heard it in some other work of fiction that quotes Hemingway.
I like this one, it really says don't measure yourself against others
"There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self."
You're not fronting having read all Hemingway, you're sharing a quote with everyone. It's fine if you heard it in Kingsman, just as it would have been fine if you had heard it in some other work of fiction that quotes Hemingway.
I like this one, it really says don't measure yourself against others