“Do you have a few items you’d like me to wash?” I asked a visitor to our home in London. His face lit up, and as his daughter walked by, he said, “Get your dirty clothes—Amy’s doing our laundry!” I smiled, realizing that my offer had been extended from a few items to a few loads.

Later as I hung clothes outside on the line, a phrase from my morning’s Bible reading floated through my mind: “In humility value others above yourselves” (Phil. 2:3). I had been reading Paul’s letter to the people of Philippi, in which he exhorts them to…