Correct me if I'm wrong, but I believe that quote is from the manual, and is something that Joseph F. Smith said. Esther had it written up on the board during her lesson today and it really does sum things up well.
We talked a lot about how staying married is a choice that we each make with our spouses every day. The triangle below was referenced during the lesson, it illustrates how the husband and wife need to strengthen their relationship with God (individually and as a family), in order to draw closer to him and to each other, so they can better become one.
I am so grateful for my husband and the things he does for me. I have noticed that when we each draw closer to the Lord, we do naturally draw closer to each other. Maybe it is because we both have a heightened level of the spirit, which helps us better meet each other's needs.
Anyways, marriage is great - feel free to leave your comments below!