Because the daughters of Noah married the sons of men contrary to the teachings of the Lord, his anger was kindled, and this offense was one cause that brought to pass the universal flood. You will see that the condition appears reversed in the Book of Moses. It was the daughters of the sons of God who were marrying the sons of men, which was displeasing unto the Lord. The fact was, as we see it revealed, that the daughters who had been born, evidently under the covenant, and were the daughters of the sons of God, that is to say of those who held the priesthood, were transgressing the commandment of the Lord and were marrying out of the Church. Thus they were cutting themselves off from the blessings of the priesthood contrary to the teachings of Noah and the will of God .... "Today there are foolish daughters of those who hold this same priesthood who are violating this commandment and marrying the sons of men; there are also some of the sons of those who hold the priesthood who are marrying the daughters of men. All of this is contrary to the will of God just as much as it was in the days of Noah." — Joseph Fielding Smith, "Answers to Gospel Questions," 1:136-37
As with baptism, so it is with celestial marriage. It opens the door, a second door. It starts one out in the direction of exaltation. It puts one on the path that leads to eternal life. You cannot get on the path without entering the gate, but having entered the gate then you must traverse the length of the path. The process of going up that path is the process of keeping the covenant made in connection with this holy order of matrimony. It is the process of obeying the laws, commandments, principles, and ordinances of the gospel." — Bruce R. McConkie, "The New and Everlasting Covenant of Marriage," April 20, 1960, "BYU Speeches of the Year"
When two Latter-day Saints are united together in marriage, promises are made to them concerning their offspring that reach from eternity to eternity. They are promised that they shall have the power and the right to govern and control and administer salvation and exaltation and glory to their offspring worlds without end. And what offspring they do not have here, undoubtedly there will be opportunities to have them hereafter. What else could man wish? A man and a woman in the other life, having celestial bodies, free from sickness and disease, glorified and beautified beyond description, standing in the midst of their posterity, governing and controlling them, administering life, exaltation and glory, worlds without end!" — Lorenzo Snow, "Collected Discourses," 5 vols. [Burbank, Calif., and Woodland Hills, Ut.: B.H.S. Publishing, 1987-1992], Volume 5
If we fail to teach chastity, we will reduce the number of temple marriages, and if we reduce the number of temple marriages, we will reduce the number of truly Latter-day Saint homes. Of course, we realize that simply going to the temple without proper preparation in every way does not bring the blessings we seek. Eternal marriage rests on a maturity and commitment that—with the endowment and ordinances—can open the gates of heaven for many blessings to flow to us.
To help our youth abide by the principles involved in temple marriage, we must help them to understand that temple marriage is more than just a place where the ceremony occurs; it is a whole orientation to life and marriage and home. It is a culmination of building attitudes toward the Church, chastity, and about our personal relationship with God—and many other things. Thus, simply preaching temple marriage is not enough. Our family home evenings, seminaries, institutes, and auxiliaries must build toward this goal, not by exhortation alone but by showing that the beliefs and attitudes involved in temple marriage are those which can bring the kind of life here and in eternity that most humans really want for themselves. Properly done, we can show the difference between the 'holy and the profane' so that the powerful, natural instincts of motherhood are decisive in the young woman who wavers between those holy instincts and the path of pleasure-seeking. With real judgment and combined curricular effort, we can show the young man that the way of the world—however much it gets glamorized and regardless of how clever its Casanovas appear—is the way of sadness; it is the way which will finally frustrate those deep inner yearnings he has for hearth and home and the joys of fatherhood.
We will need to show the way to temple marriage with enough honest and plain speaking so that when our youth are persuaded, they can outlast those circumstances they may be in, such as being away at college or in the military, which do not offer them eligible partners; they will know that temple marriage is worth waiting for!" — "Teachings of Harold B. Lee," p. 244