Over the last week, the Cubs opened their home season at Wrigley Field, and the city's Lyric Opera was presenting Richard Wagner's four-opera "Ring des Nibelungen," which meant that two of the world's most fervid fan bases were simultaneously encamped on opposite sides of the Chicago River.
-- Bruce Weber, "Take Me Out to the Opera: In Chicago, a Fan Is a Fan", New York Times, April 16, 2005
The words of fire that from his pen Were flung upon the fervid page, Still move, still shake the hearts of men, Amid a cold and coward age.
-- William Cullen Bryant
Fervid comes from Latin fervidus "glowing, burning, vehement," from fervere "to boil, glow." The figurative sense of "impassioned" is from 1656.