Pastors of souls are obliged to take care that their ecclesiastical community offers the Christian faithful the assistance by which the matrimonial state is preserved in a Christian spirit and advances in perfection. This assistance must be offered especially by: 1/ preaching, catechesis adapted to minors, youth, and adults, and even the use of instruments of social communication, by which the Christian faithful are instructed about the meaning of Christian marriage and about the function of Christian spouses and parents; 2/ personal preparation to enter marriage, which disposes the spouses to the holiness and duties of their new state; 3/ a fruitful liturgical celebration of marriage which is to show that the spouses signify and share in the mystery of the unity and fruitful love between Christ and the Church; 4/ help offered to those who are married, so that faithfully preserving and protecting the conjugal covenant, they daily come to lead holier and fuller lives in their family.
Source: Code of Canon Law (Vatican.va)