As all sincere promoters of Christian, Catholic, and apostolic faith strongly desire, what is needed is that this doctrine be more fully and more profoundly known and that minds be more fully imbued and formed by it. What is needed is that this certain and unchangeable doctrine, to which loyal submission is due, be investigated and presented in the way demanded by our times. For the deposit of faith, the truths contained in our venerable doctrine, are one thing; the fashion in which they are expressed, but with the same meaning and the same judgement, is another thing. This way of speaking will require a great deal of work and, it may be, much patience: types of presentation must be introduced which are more in accord with a teaching authority which is primarily pastoral in character. (Mater et Magistra, 15)