zeal

zeal (http://definr.com/zeal)

     n 1: a feeling of strong eagerness (usually in favor of a person
          or cause); "they were imbued with a revolutionary
          ardor"; "he felt a kind of religious zeal" [syn: ardor,
           ardour, elan]
     2: excessive fervor to do something or accomplish some end; "he
        had an absolute zeal for litigation"