43 All of these things, Venerable Brethren, you must consider carefully and ponder over with a lively faith if you would see in their true light the extraordinary benefits on matrimony - offspring, conjugal faith, and the sacrament. No one can fail to admire the divine Wisdom, Holiness and Goodness which, while respecting the dignity and happiness of husband and wife, has provided so bountifully for the conservation and propagation of the human race by a single chaste and sacred fellowship of nuptial union.
Source: Casti Connubii (Vatican.va)