CSDC 216

No power can abolish the natural right to marriage or modify its traits and purpose. Marriage in fact is endowed with its own proper, innate and permanent characteristics. Notwithstanding the numerous changes that have taken place in the course of the centuries in the various cultures and in different social structures and spiritual attitudes, in every culture there exists a certain sense of the dignity of the marriage union, although this is not evident everywhere with the same clarity⁴⁷⁸ Cf. Catechism of the Catholic Church, 1603.. This dignity must be respected in its specific characteristics and must be safeguarded against any attempt to undermine it. Society cannot freely legislate with regard to the marriage bond by which the two spouses promise each other fidelity, assistance and acceptance of children, but it is authorized to regulate its civil effects.