The story is about a child psychologist who liked doing repairs on his home. One Saturday he was putting the finishing touches on a driveway. The concrete was still wet as he gently smoothed it out with his mason's trowel. A few feet away stood a neighborhood boy, watching him as he worked.
Across the street was a neighbor mowing his lawn. For years the neighbor had listened as the doctor went on and on about how he loved working with kids. He kept his eye on the doctor and the little boy, wondering if there might be trouble.
Sure enough, as soon as the doctor finished his work and stood back to admire it, the boy made his move. He jumped into the concrete and ran jumping up one side and down the other.
When the boy jumped out the doctor grabbed him and began swatting his behind. The man across the street was quite amazed at the doctor's response. As the boy ran home crying and dripping wet with cement, the neighbor called across the street, "Hey, I thought you loved kids, John."
"I do love kids," the doctor replied, "but in the abstract, not in the concrete."