When the Pharisees heard that he had silenced the Sadducees, they gathered together, and one of them, a lawyer, asked him a question to test him. ‘Teacher, which commandment in the law is the greatest?’ He said to 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 greatest and first commandment. And a second is like it: “You shall love your neighbour as yourself.” On these two commandments hang all the law and the prophets.’

Matthew 22:34-40