1 Priestly celibacy has been guarded by the Church for centuries as a brilliant jewel, and retains its value undiminished even in our time when the outlook of men and the state of the world have undergone such profound changes. Amid the modern stirrings of opinion, a tendency has also been manifested, and even a desire expressed, to ask the Church to re-examine this characteristic institution. It is said that in the world of our time the observance of celibacy has come to be difficult or even impossible.
Source: Sacerdotalis Caelibatus (Vatican.va)