Mark 12:28-34 (Hebrew Names Version)
28 One of the Sofrim came, and heard them questioning together. Knowing that he had answered them well, asked him, "What mitzvah is the greatest of all?" 29 Yeshua answered, "The greatest is, 'Hear, Yisra'el, the Lord our God, the Lord is one: 30 you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.' This is the primary mitzvah. 31 The second is like this, 'You shall love your neighbor as yourself.' There is no other mitzvah greater than these." 32 The Sofer said to him, "Truly, teacher, you have said well that he is one, and there is none other but he, 33 and to love him with all the heart, and with all the understanding, with all the soul, and with all the strength, and to love his neighbor as himself, is more than all whole burnt offerings and sacrifices." 34 When Yeshua saw that he answered wisely, he said to him, "You are not far from the kingdom of God." No one dared ask him any question after that.
I find it interesting that this scribe appears to have closer to "getting it" than pretty much anyone else mentioned in the Gospels. He certainly has a better understanding of God than any other Jewish leaders mentioned in the Gospels. He seems to understand better than most, if not all, of the apostles.
While a central focus of the Sermon on the Mount was the importance of our heart and our relationship with God, very few people seemed to grasp that. There was an intense legalism that Christ was constantly fighting (and that we still fight).
If only we could maintain our focus on the two greatest commands, life as a Christian would be so much better.