At least once a week, sometimes more often, I ask my boys: "What's the most important thing in all the world?"
The rehearsed answer is "Loving and serving Jesus!" (cf. Deut. 6:5)
Then I ask, "What's the second most important thing in all the world?"
Answer: "Loving and serving other people." (cf. Lev. 19:18)
This simple catechism reinforces Matt. 22:37-40. There is nothing in life that does not hang upon Loving God and Loving others.
Yesterday, when I asked Daniel the first question, he ran them both together: "Loving and serving Jesus and loving other people."
When I insisted that we have to serve other people, he balked: "Why do we have to serve other people?" And that led to a discussion of Jesus as the greatest servant and his statement, "If anyone would be great among you, let him be the servant of all."