Does the quote *HAVE* to be from an essay or book?

<p>Like most, I wrote an essay about an experience with the intention of finding a quote afterwards. I have found a quote that fits perfectly, but it's not from a particular work---the person simply SAID it at some point, I think.
Will the adcoms look down on that?</p>

<p>Mine was spoken by an author, but I don’t know exactly where it came from. It could be an essay/book, or not. </p>

<p>Im not too worried about it.</p>

<p>Great, thanks!</p>