I was looking at the most important class taking place in Cambridge, Massachusetts, that day.

 Nearly 25 years ago, our family lived in Massachusetts, where I was enrolled in graduate school. My program of study was very demanding, leaving me little free time. One Sunday in church the ward Primary president approached me and asked if I might substitute as a Primary teacher for two weeks. Primary was then held on a weekday afternoon, and I knew it would be difficult to find room in my schedule to teach the class. But after some hesitation, I agreed.

The appointed day came to teach Primary. That afternoon I was in the university library, absorbed in a book on international politics. The subject I was studying seemed somehow more important than the upcoming Primary class. Consequently, I procrastinated until just 30 minutes before the class was to begin to review the lesson I was to teach. Then I walked from the library down to our ward chapel on the edge of campus. My reluctant attitude must have slowed my steps, for I arrived a few minutes late. As I stepped to the door of the Primary room, the children were just beginning to sing the opening hymn. It was a song I had never heard before, a song whose melody and message touched me deeply:

As I have loved you,

Love one another.

This new commandment:

Love one another.

By this shall men know

Ye are my disciples,

If ye have love

One to another.

(“Love One Another,” Hymns, no. 308)

As I stood there, transfixed in the doorway, the Spirit bore witness that I was looking at the most important class taking place in Cambridge, Massachusetts, that day.

Back at the university in dozens of classrooms and laboratories, dedicated scholars were pursuing answers to the world’s problems. Yet valuable though such efforts may have been, the university did not and could not hold the ultimate answers to the problems of a troubled world. Here before me was the Lord’s answer: the quiet building up of His kingdom on earth by the teaching of the gospel of Jesus Christ. What was taking place in Primary that day was a small part of a divinely revealed plan for the salvation of a fallen world.

Building the Kingdom, Elder Bruce D. Porter,  April 2001