Abstract
Vitalism has been given different definitions and diverse figures have been labelled as vitalists throughout the history of ideas. Concentrating on the seventeenth century, we find that scholars identify as vitalists authors who endorse notions that are in diametrical opposition with each other. I briefly present the ideas of dualist vitalists and monist vitalists and the philosophical and theological considerations informing their thought. In all these varied forms of vitalism the identifiable common motives are the essential irreducibility of life and the universality of life.