Source : Webster's Revised Unabridged Dictionary (1913)

Fervency \Fer"ven*cy\, n. [Cf. OF. fervence. See {Fervent}.]
   The state of being fervent or warm; ardor; warmth of feeling
   or devotion; eagerness.

         When you pray, let it be with attention, with fervency,
         and with perseverance.                   --Wake.

Source : WordNet®

fervency
     n : feelings of great warmth and intensity; "he spoke with great
         ardor" [syn: {ardor}, {ardour}, {fervor}, {fervour}, {fire},
          {fervidness}]