Final answer:
Matthew cared deeply about Christian universalism, the equality of all humans, and this theme is depicted in various artistic interpretations, such as Caravaggio's painting and the different portrayals in gospel manuscripts.
Step-by-step explanation:
Matthew really cared about Christian universalism and the principle that all human beings are spiritually equal. This belief was part of the early Christian emphasis on the spiritual needs of the common people, even social outcasts, and was in direct opposition to the Roman system of social hierarchy. Matthew's dedication is evident not only in the texts but also in the artistic representations, such as the painting The Martyrdom of Saint Matthew by Caravaggio and the portrayals in the Ebbo and Coronation Gospels, where his posture varies from frantically writing to calmly contemplating.