Zeal is dedication or enthusiasm for something. If you have zeal, you're willing, energized, and motivated. Zeal is often used in a religious sense, meaning devotion to God or another religious cause, like being a missionary.
https://www.vocabulary.com/dictionary/zeal

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Note added at 43 mins (2024-01-07 22:14:35 GMT)
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fervent or enthusiastic devotion, often extreme or fanatical in nature, as to a religious movement, political cause, ideal, or aspiration
https://www.collinsdictionary.com/dictionary/english/zeal