sentences:  While these writings were rather obscure, Severinus persisted in understanding the concepts through his own empirical experiments and by applying the teachings of ancient Greeks in matters of theory and observation.Severinus increasingly found traditional Aristotelian and Galenic medical methods unsatisfactory and likewise began to embrace chemistry and the teachings of Paracelsus to create efficacious drugs.The compounds most often relied on were those with “strong manifest qualities” such as smell, which were believed to be an indication of their effectiveness.