zeal

(noun) a feeling of strong eagerness (usually in favor of a person or cause). Synonyms: ardor, ardour, elan. Examples: "They were imbued with a revolutionary ardor." "He felt a kind of religious zeal."

(noun) excessive fervor to do something or accomplish some end. Example: "He had an absolute zeal for litigation."

(noun) prompt willingness. Synonyms: readiness, eagerness, forwardness. Examples: "Readiness to continue discussions." "They showed no eagerness to spread the gospel." "They disliked his zeal in demonstrating his superiority." "He tried to explain his forwardness in battle."