Article — Slater, Manual of Moral Theology
Article IX. Solemn Vows and Sacred Orders
A solemn vow of chastity, taken in a religious order, strictly so called, or taken implicitly when sacred Orders are received in the Latin Church, is a diriment impediment of marriage by ecclesiastical law. This has long been the practice of the Western Church, and it was solemnly enunciated by the Council of ‘Trent: “ If anyone saith that clerics constituted in sacred Orders, or regulars who have solemnly professed chastity, are able to contract marriage, and that being contracted it is valid, notwithstanding the ecclesiastical law or vow; and that the contrary is nothing else than to condemn marriage; and that all who do not feel that they have the gift of chastity, even though they have made a vow thereof, may contract marriage; let him be anathema: seeing that God refuses not that gift to those who ask for it rightly, neither does he suffer us to be tempted above that which we are able.”1
In the Eastern Church marriage may be contracted before receiving sacred Orders, and those who have married may use their marital rights after receiving sacred Orders, but sacred Orders are a bar to contracting a new marriage. This shows that sacred Orders, apart from the vow, which in the Latin Church is taken when they are received, are a diriment impediment of marriage. By a special privilege, the simple vow of chastity taken by members of the Society of Jesus at their first profession is also a diriment impediment of marriage.
p. ii, 222–223
As this impediment owes its origin to ecclesiastical law, the Church can dispense in it, but she seldom does so except for grave reasons which concern the public weal. Leo XIII granted bishops the faculty of dispensing, by themselves or through some trusty ecclesiastic, the sick who are in great danger of death so that there is not time to have recourse to the Holy See, from all, even public, impediments which annul marriage by ecclesiastical law, except the priesthood and affinity in the direct line arising out of the lawful use of marriage.1 This was confirmed and extended by Canons 1043, 1044.
1 S.0., February 20, 1888.
p. ii, 223