The laird Glenross sunk on his knees by the side of the bed, on which she lay extended in death; his hands were clasped, his eyes closed, and his head bent downwards; the whisperings of a fervent devotion burst from his lips.
-- Francis Lathom, The Mysterious Freebooter; or, The Days of Queen Bess, 1806
He had heard Miss Ophelia speak often of a cough, that all her medicaments could not cure; and even now that fervent cheek and little hand were burning with hectic fever; and yet the thought that Eva's words suggested had never come to him til now.
-- Harriet Beecher Stowe, Uncle Tom's Cabin, 1852
Fervent first entered English in the 1300s and ultimately comes from the Latin fervēre meaning "to boil."