Addressing national directors of the Pontifical Mission Societies on May 17, 2010, Cardinal Ivan Dias said that "the world needs priests and missionaries in 3D -- people who maintain doctrine, discipline, devotion." According to the Catholic Culture website, the prefect of the Congregation for the Evangelization of Peoples invoked Cardinal John Henry Newman as a model as he explained this concept.
Safeguarding doctrine -- the first dimension -- means being faithful to the Word of God.
Discipline -- the second dimension -- includes formation in chastity and proper relations with the opposite sex and the management of discord and conflict in relationships and in the community.
Devotion means that the priest -- in each of his small daily actions -- should bear in mind that he is a man of God. He should give primacy to the spirit, keeping in mind that he is in the world, but not of the world.