It created an intellectual centre in Heidelberg that more than rivalled the older Reformed centres of Geneva, Bern, and Zurich. Indeed, given the impact of Erastus’ views on church and state and his important natural philosophical works, Ursinus’ and Zanchius’ systematic formulation, Olevianus’ covenant thought, and Tremellius’ biblical scholarship, Heidelberg was arguably more important to the development of international Reformed thought than the Geneva of Beza. ~Brill Primary Sources Online (Muller, Gunnoe)