From a small collection of juvenile literature at the PCA Historical Center, the following artwork is from a Scottish publication titled THE MORNING WATCH, dated 1910. The caption reads:

“These young Scottish theologians are settling the point as to whether the Shorter Catechism says the Sum of the Ten Commandments is . . .  to love our NEIGHBOR, or, our NEIGHBORS. The upper boy says it’s the plural, the under says it’s the singular, each of them, especially the upper one, forgetting that the important thing in the sentence is not the letter S, but the word LOVE. But so did their fathers before them!