Catechesis: The Sixth Commandment

In general and in all conditions it is solemnly commanded by God that men and women, who were created for marriage, shall be found in this estate. Yet there are some exceptions (although few) that God has especially set apart. They are not fit for the married estate. Or there are individuals whom He has released by some high, supernatural gift so that they can maintain chastity without this estate.—LC I:211