The phrase "burn with fervor" is often used to describe someone who is passionate and driven. However, there are several synonyms that can be used to convey the same sentiment. One alternative is "ignite with zeal," which suggests a strong sense of enthusiasm or eagerness. Another synonym is "flare with fervency," which implies an intense and focused energy. "Blaze with ardor" can also be used to describe someone who is highly motivated and enthusiastic about their pursuits. Overall, there are many ways to describe someone who is burning with fervor, and using different synonyms can help add variety and nuance to your writing or conversation.