82 So it is easy to realize what great joy it brought Our predecessors to point out an example like this to be imitated by those who guide the Christian people; for the proper and careful exercise of the teaching office by the clergy is of great importance. In speaking of this, St. Pius X had this to say: "We want especially to pursue this one point and to urge strongly that no priest has any more important duty or is bound by any stricter obligation." (86)
Source: Sacerdotii Nostri Primordia (Vatican.va)