And With Medium Power Comes Not-So-Great Responsibility

I have a silly question that I should know the answer to and don't.

An oft-quoted line from the Spider-Man comic book goes as follows: "With great power comes great responsibility."

Was that line (reasonably) original to the comic? Or is it a quote from somewhere else? I have a vague idea that it was famously uttered by Sir Winston Churchill but the quotation books I have handy here either don't mention it or attribute it to Spider-Man or Stan Lee.

Can someone give me an answer? And if you're saying it was a known quote before that, could we have a source, please?