Did Sir James Macintosh quote The powers of a man's mind are directly proportional to the quantity of coffee he drinks?

It has been proven that caffene increases blood flow, increasing oxygen levels to the brain. The author of the quote was both a physician and a lawyer, as well as studied philosphy. I believe the quote was from him, given his educational background. Then again, I found the same qote in a coffee shop bathroom wall, which made me look up the author. Can you really trust a coffee shop asking you to drink more coffee? Given the background of Sir James, he could be the author.