"Moral fervor" refers to a strong passion or intensity about doing what is right or adhering to one's principles and values. It means deeply caring about morals and being motivated to act in accordance with them. Full definition
These myths include the notion that fanatical inquisitors were responsible for the execution of millions of alleged witches; that benighted medieval churchmen suppressed scientific knowledge; and that plantation economics, not Christian moral fervor, brought an end to slavery. (religion-online.org)
It won millions for the Churches and imbued all with a new moral fervor. (religion-online.org)
It sum, it would seem that the civil rights movement made a massive error in investing so much time, energy, and moral fervor in such a dubious cause as mandatory school busing. (firstthings.com)