 As the intellect is able to consider separately things that are together and to separate things that are not together in reality, truth and falsity have to do with the composition and division of the species of things in the soul and not in extramental  things.[18]  That is to say, ‘the composition and division that thought brings about must have reference to the being and not-being of things outside  thought’.[19]  Complex expressions are true in cases in which they conform to the way the things are outside the combining mind, and they are signified by the terms—the predicate and  subject.[20]  The intentions (intentiones or passiones animae) in the soul and their combinations exist in the soul as signs (signa) of extra-mental things.