The quote that I used in my profile for quite some time was:
"Ah, that is a perfume in which I delight; when they roast coffee near my house, I hasten to open the door to take in all the aroma."
Jean Jacques Rousseau
1712 - 1778
Some others lifted from the web are:
"Coffee should be black as hell, strong as death and as sweet as love."
"Coffee in England always tastes like a chemistry experiment."
"Espresso is to Italy, what champagne is to France."
Charles Maurice de Talleyrand
"How sweet coffee tastes! Lovlier than a thousand kisses, sweeter than Muscatel wine!"
Johann Sebastian Bach (Coffee Cantata)
"The morning cup of coffee has an exhilaration about it which the cheering influence of the afternoon or evening cup of tea cannot be expected to reproduce."
Oliver Wendall Holmes Sr.