FERVENCY
ardor, ardour, fervor, fervour, fervency, fire, fervidness
(noun) feelings of great warmth and intensity; “he spoke with great ardor”
Source: WordNet® 3.1
Noun
fervency (usually uncountable, plural fervencies)
The state of being fervent.
Source: Wiktionary
Fer"ven*cy, n. Etym: [Cf. OF. fervence. See Fervent.]
Definition: 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: Webster’s Unabridged Dictionary 1913 Edition