In March, I went to visit Kenya. I kissed my husband goodbye and left him at home. Or so I thought. But when I got to Kenya, I found him all over the place.

At Moffatt Bible College in Kijabe, for example, the librarian gave me a tour. One set of double doors opened to the textbook closet. Most students can’t afford to buy books for their classes, so here they can check out the required texts for the term. In the center of the center shelf was a stack of The Supremacy of God in Preaching.

Later that week, at a workshop in Old Kijabe Town, Peter heard that I was John Piper’s wife. He turned his smile on me and said, “Missions is not the ultimate goal of the church. Worship is. Missions exists because worship doesn’t. . . . Worship, therefore, is the fuel and goal in missions,” quoting from Let the Nations Be Glad.

Peter is a graduate of Moffatt Bible College and is now the Assistant Pastor at Kijabe Mission Church. I wouldn’t have been surprised by a former student telling me that he appreciated my husband’s book. But I was blown away that a couple of years after Peter completed his missions class, he still could quote word for word from the textbook—that’s impact.