30 These, then, are the elements which compose the blessing of conjugal faith: unity, chastity, charity, honorable noble obedience, which are at the same time an enumeration of the benefits which are bestowed on husband and wife in their married state, benefits by which the peace, the dignity and the happiness of matrimony are securely preserved and fostered. Wherefore it is not surprising that this conjugal faith has always been counted amongst the most priceless and special blessings of matrimony.
Source: Casti Connubii (Vatican.va)