Fervency (noun)

Intense passion, warmth, or earnestness; great enthusiasm.

Origin:

Fervency is derived from the latin word ferventia, which means "heat" or "ardor".

Examples:

1. He spoke with fervency about the cause he believed in.
2. Her fervency for her work was evident in the way she talked about it.
3. He approached the task with a fervency that was contagious to his team.
4. The fervency of her faith was inspiring to those around her.
5. He wrote the letter with fervency, expressing his strong feelings on the matter.