Q.47: What is the sum of the Ten Commandments?
A. 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.
Jesus said unto him, You shall love the Lord your God with all your heart, and with all your soul, and with all your mind. This is the first and great commandment. And the second is like unto it, you shall love your neighbor as yourself. On these two commandments hang all the law and the prophets. Mat. 22:37-40