One of Thomas Aquinas’s central ideas is his attempts to show how it is possible to speak about the incomprehensible God. To reach a better understanding of this project, it is necessary to gain some insight into how he used the theories he acquired during his time in the faculty of arts in his philosophical-theological works. This text deals with the question which, despite the current flourishing of the studies of the medieval philosophy of language, has not recieved much attention. The application of the theories of signification and supposition as well as the doctorine of the modi significandi is reconstructed systematically. Consequently the traditional doctorine of analogy appears in a new light. The interpretations of the texts in question are exemplary for the work of the philosophical interpretation. The reader is guided by overviews, schematical drawings and references.