No Master of Theology is 100% Correct?

Does God permit theologians to make some errors for the sake of their humility and for the sake of ours, so that we recognize that no human teacher has all of the answers? If this is the case then how does this affect our understanding of what teaching [of theology] is? It is not just recognizing that some teachers are better than others (authorities) and going over their reasoning but we also have to return to the sources as another check?