Since I'd already read this quote earlier today while reading through the Eternal Marriage Student Manual and it quickly came to mind upon reading your question.
The Right Person
President Gordon B. Hinckley
“Be worthy of the mate you choose. Respect him or her. Give encouragement to him or her. Love your companion with all your heart. This will be the most important decision of your life, the individual whom you marry.
“There is no substitute for marrying in the temple. It is the only place under the heavens where marriage can be solemnized for eternity. Don’t cheat yourself. Don’t cheat your companion. Don’t shortchange your lives. Marry the right person in the right place at the right time.
“Choose a companion of your own faith. You are much more likely to be happy. Choose a companion you can always honor, you can always respect, one who will complement you in your own life, one to whom you can give your entire heart, your entire love, your entire allegiance, your entire loyalty. . . .
“. . . I could not wish for any of you more than I have had in my companionship with my beautiful wife.
“A good marriage requires time. It requires effort. You have to work at it. You have to cultivate it. You have to forgive and forget. You have to be absolutely loyal one to another. Most of you will marry and have children. They will become the source of your greatest pride and happiness. . . .
“All of this can come to pass if you make this most important decision, one guided by prayer as well as instinct, of choosing a dear companion who will be yours through thick and thin forever, throughout all eternity” ( “Life’s Obligations,” Ensign, Feb. 1999, 2, 4 ).