From his beliefs in nominalism in conjunction with his Aristotelian influences follows his reasoning on the object of scientific knowledge. Marsilius claims such an object must be singular and conform to Aristotle's requirement that such an object must be a necessary universal. Therefore, given Marsilius’ acceptance of the basic nominalist foundation—that is, universals are only in the mind—objects of science are predicates which exist in the mind and describe the individuals in the world outside of the mind.