Pastor walks his children through Westminster Shorter Catechism question 42-especially explaining how loving God with one's whole being is the purpose of our existence, and the only true way to love oneself, which demands that we also desire the same for our neighbor. --Q42. What is the sum of the ten commandments-- The sum of the ten commandments is to love the Lord our God with all our heart, with all our soul, with all our strength, and with all our mind- and our neighbor as ourselves.