Coffee!!!
Jules Michelet said: "Coffee, the sober drink, the mighty nourishment of the brain, which unlike other spirits, heightens purity and lucidity; coffee, which clears the clouds of the imagination and their gloomy weight; which illuminates the reality of things suddenly with the flash of truth."
(from Peter Leithart's blog at http://www.leithart.com/archives/001597.php)
(from Peter Leithart's blog at http://www.leithart.com/archives/001597.php)