Both Uses of

zeal
in
Moby Dick

...but in their hasty zeal to befriend him, and from the circumstance that both he and the sharks were at times half hidden by the blood-muddled water, those indiscreet spades of theirs would come nearer amputating a leg than a tail.
Chpt 70-72 *

zeal = enthusiasm

So that, through their zeal for him, they had all conspired, so far as in them lay, to muffle up the knowledge of this thing from others; and hence it was, that not till a considerable interval had elapsed, did it transpire upon the Pequod's decks.†
Chpt 106-108

zeal = active interest and enthusiasm