[M]y heart weeps for the sisters who haven’t had the opportunity to marry. Some of you may feel lonely and unappreciated and cannot see how it will be possible for you to have the blessings of marriage and children or your own family. All things are possible to the Lord, and He keeps the promises He inspires His prophets to declare. Eternity is a long time. Have faith in those promises and live to be worthy of them so that in His time the Lord can make them come true in your life. With certainty, you will receive every promised blessing for which you are worthy. ("The Eternal Blessings of Marriage," Ensign, May 2011)
Through the merciful plan of our Father in Heaven, persons who desire to do what is right but through no fault of their own are unable to have an eternal marriage in mortal life will have an opportunity to qualify for eternal life in a period following mortality, if they keep the commandments of God and are true to their baptismal and other covenants (Lorenzo Snow, Millennial Star, 31 Aug. 1899, p. 547; discussed in Dallin H. Oaks, Pure in Heart (Salt Lake City: Bookcraft, 1988), pp. 61–62). (Ensign, Oct 1995, 7)
Now, there are those among you fine young members of the Church who might never marry. Although they are worthy in every way, they may never find someone to whom they will be sealed in the temple of the Lord in this life. There is no way for those who have not experienced this despair to truly understand the loneliness and pain they might feel. I know of many women who want more than anything else to be a wife and a mother, and they cannot understand why their prayers have never been answered. There are many single men who, for whatever reason, also find themselves alone.
First, let me tell you that your prayers are heard. Your Father in Heaven knows the desires of your heart. I cannot tell you why one individual’s prayers are answered one way while someone else’s are answered differently. But this I can tell you: the righteous desires of your hearts will be fulfilled.
Sometimes it can be difficult to see anything beyond the path immediately before us. We are impatient and do not want to wait for a future fulfillment of our greatest desires. Nevertheless, the brief span of this life is nothing in comparison with eternity. And if only we can hope and exercise faith and joyfully endure to the end—and I say joyfully endure to the end—there, in that great heavenly future, we will have the fulfillment of the righteous desires of our hearts and so very much more that we can scarcely comprehend now.
In the meantime, do not wait for someone else to make your life complete. Stop second-guessing yourself and wondering if you are defective. Instead, seek to reach your potential as a child of God. Seek learning. Become engaged in a meaningful career, and seek fulfillment in service to others. Use your time, your talents, and your resources to improve yourself and bless those around you. All of this is part of your preparation for having a family. Immerse yourself in your ward or branch and seek to magnify your callings, no matter what they may be.
The great purpose of this mortal existence is to learn to fully love our Heavenly Father and our neighbor as ourselves. If we do this with all our might, mind, and strength, our eternal destiny will be glorious and grand beyond our capacity to imagine. Be faithful, and things will work out for you. That is His eternal promise to all who love and honor Him. (CES Fireside for Young Adults, November 1, 2009)