zeal

a feeling of strong eagerness (usually in favor of a person or cause)

Passionate ardor in the pursuit of anything; eagerness in favor of a person or cause; ardent and active interest; engagedness; enthusiasm; fervor.

Old French zele, from Latin zelus

“Hadrian." The wise youth returned to Lady Blandish, and informed her of Benson's zeal.”

— George Meredith, Complete Project Gutenberg Works of George Meredith

Priya, a Lima librarian, found zeal in her quest to organize books. One day, she spotted a mischievous parrot flipping pages instead of perusing them. With the fervor of new converts, Priya launched a campaign for bird-proof bookends, turning annoyed squawks into silent reads.

At Lahore's vibrant Badshahi Mosque, Rohan climbed the steep steps to the top of the minaret, his eyes gleaming with zeal as he waved a bright green banner high above the crowd gathered below, urging them to support the environmental rally.

“They were subsequently united in the 10th century and, with the zeal of new converts, launched several campaigns against the "Sudanese" (pagan peoples of sub-Saharan Africa).”