23 Being thoroughly prepared by the knowledge of the ancient languages and by the aids afforded by the art of criticism, let the Catholic exegete undertake the task, of all those imposed on him the greatest, that namely of discovering and expounding the genuine meaning of the Sacred Books. In the performance of this task let the interpreters bear in mind that their foremost and greatest endeavor should be to discern and define clearly that sense of the biblical words which is called literal. Aided by the context and by comparison with similar passages, let them therefore by means of their knowledge of languages search out with all diligence the literal meaning of the words; all these helps indeed are wont to be pressed into service in the explanation also of profane writers, so that the mind of the author may be made abundantly clear.
Source: Divino Afflante Spiritu (Vatican.va)