13 We also, by this Encyclical Letter, desire to insure that the work may not only proceed without interruption, but may also daily become more perfect and fruitful; and to that end We are specially intent on pointing out to all what yet remains to be done, with what spirit the Catholic exegete should undertake, at the present day, so great and noble a work, and to give new incentive and fresh courage to the laborers who toil so strenuously in the vineyard of the Lord.
Source: Divino Afflante Spiritu (Vatican.va)