Zeo describes being fervent in spirit, shown in earnest teaching and devoted service.

The two occurrences show a single use of fervency in spirit: Acts 18:25 connects it with speaking and teaching concerning Jesus, while Romans 12:11 places it alongside diligence and serving the Lord.

1. Fervency expressed in teaching and service · dominant

   Both forms are present active participles in clauses concerning spirit. In Acts 18:25, the singular form describes the man who spoke and taught accurately concerning Jesus; the APB renders the clause "being fervent in spirit." In Romans 12:11, the plural form stands with diligence and serving the Lord; the APB renders "in the spirit fervent."

   Acts 18:25Romans 12:11

In the Anselm Project Bible: The APB presents both occurrences with "fervent" in connection with spirit: "being fervent in spirit" in Acts 18:25 and "in the spirit fervent" in Romans 12:11.