60 Today it could hardly be hoped that the clergy could hold a similar primacy in every branch of knowledge; the range of human science has become so vast that no man can comprehend it all, much less become distinguished in each of its numberless branches. Nevertheless wise encouragement and help should be given to those members of the clergy, who, by taste and special gifts, feel a call to devote themselves to study and research, in this or that branch of science, in this or that art; they do not thereby deny their clerical profession; for all this, undertaken within just limits and under the guidance of the Church, redounds to the good estate of the Church and to the glory of her divine Head, Jesus Christ. And among the rest of the clergy, none should remain content with a standard of learning and culture which sufficed, perhaps, in other times; they must try to attain - or, rather, they must actually attain - a higher standard of general education and of learning. It must be broader and more complete; and it must correspond to the generally higher level and wider scope of modern education as compared with the past.
Source: Ad Catholici Sacerdotii (Vatican.va)